JP3246209B2 - Method and apparatus for measuring chromaticity and turbidity of solvent containing colloidal substance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring the chromaticity and turbidity of a solvent containing both a soluble absorbing substance and a colloidal substance.

[0002]

2. Description of the Related Art For example, with respect to the quality of tap water supplied from a waterworks, visual inspection of color and turbidity is required by law, but color is substituted by chromaticity, and turbidity is substituted by turbidity. It is possible to do so. Chromaticity is defined as absorbance at a wavelength of 390 nm, turbidity is defined as absorbance at a wavelength of 660 nm, and absorbance measures the amount of attenuation of transmitted light.

[0003] However, the chromaticity of the solvent to be measured is an index of the concentration of the light absorbing substance contained in the solvent, and should be expressed in terms of the concentration of a standard substance. The measurement of chromaticity is generally performed only when the solvent to be measured does not contain turbidity. Considering both the light absorption component originally dissolved in water and the light absorption component of a colloidal substance in which fine particles are dispersed. Is more desirable.

The measurement of the absorbance as a reference is carried out by placing the solvent to be measured in a container (optical cell) that transmits light, irradiating a light beam and measuring the attenuation of the transmitted light.
If there is no turbidity between the concentration of the light absorbing substance and the absorbance,
The following Lambert-Beer law holds. Absorbance _{= -log (I / I 0)} = εCL here, I _0: intensity of irradiated light I: transmitted light intensity C: concentration of absorbing substances L: optical path length epsilon: a substance-specific constants (absorption coefficient).

Although the extinction coefficient ε of the solvent to be measured is generally unknown, a calibration curve of the concentration of the standard substance and the absorbance is prepared, and the absorbance of the solvent to be measured is measured. The chromaticity of the solvent to be measured can be calculated by converting the absorbance into a standard substance concentration. On the other hand, in the measurement of turbidity, the turbidity is an index of the concentration of a turbid substance, that is, a colloidal scattered light-absorbing substance, and should be indicated in terms of the concentration of a standard substance. There is a concept that a soluble light-absorbing substance is contained as a turbid substance, but in general, it is often handled only with a colloidal substance excluding the soluble light-absorbing substance.

The turbidity measurement can be roughly classified into the following three methods. These methods will be described with reference to FIGS. 3 (a) to 3 (c). As shown in FIG. 3A, the first method is a method for measuring the amount of attenuation of transmitted light in the same manner as the chromaticity. The light 2 from the light source 1 is applied to the optical cell 4 containing the solvent 3 to be measured. And the transmitted light 5 indicated by the arrow is measured by the light receiver 6a. At this time, if there is no soluble light-absorbing substance in the solvent 3 to be measured, the scattering of light derived from the concentration of the colloid component and the attenuation of transmitted light due to light absorption are approximately the same as Lambert-Beer's law. And the following equation holds.

Attenuation of transmitted light = −log (I / I ₀ ) = τTL where I ₀ : irradiation light intensity I: transmitted light intensity T: concentration of turbidity L: optical path length τ: proportional constant

The turbidity of the measured solvent 3 is determined by preparing a calibration curve of the concentration of the standard substance and the amount of attenuation of transmitted light, measuring the amount of attenuation of transmitted light of the sample, and calculating the amount of attenuation of transmitted light from the calibration curve. It can be obtained by converting to a concentration. The second method is a method of measuring the intensity of scattered light, as shown in FIG. 3 (b). Light 2 from a light source 1 is applied to an optical cell 4 containing a solvent 3 to be measured, The scattered light 7 indicated by the forward arrow is measured by the light receiver 6b. At this time, when a certain amount of the soluble light-absorbing substance is contained in the solvent 3 to be measured, the concentration of the colloid component and the scattered light intensity are almost proportional, and are expressed by the following equation.

[0010] Scattered light intensity (I _S ) = kT k: proportionality constant The turbidity of the solvent 3 to be measured is expressed by converting a standard substance concentration into a standard curve after preparing a calibration curve with the standard substance. The third method is
As shown in FIG. 3C, the integrating sphere 8 and the two light receivers 6
In this method, the transmitted light intensity and the total scattered light intensity are measured by using a and 6b. Light 2 from a light source 1 is condensed by a lens 9 and passed through an optical cell 4 containing a solvent 3 to be measured. The intensity (I _t ) of the transmitted light 5 of the light 2 incident on the integrating sphere 8 is measured by the light receiver 6a, and the intensity (I _S ) of the scattered light 7 is measured by the light receiver 6b.
Is to be measured. In this case, the irradiation light intensity after subtraction of the effects of soluble light absorbing material as (I _t + I _S), can be obtained turbid medium concentration (T) by the following equation.

I _S / (I _t + I _S ) = kT k: proportionality constant The turbidity of the solvent 3 to be measured is converted into a standard substance concentration after preparing a calibration curve with a standard substance.

[0011]

However, based on the idea that chromaticity is used as an index of the concentration of the light-absorbing substance and turbidity is used as an index of the concentration of the colloidal scattered light-absorbing substance, as described above, the soluble light-absorbing substance is used. In order to measure the chromaticity and turbidity of the solvent to be measured containing both the turbidity and the turbidity (colloidal scattered light-absorbing substance), the above-described conventional method has the following problems.

First, in the measurement of chromaticity based on the absorbance, when turbidity is present, the amount of transmitted light changes due to light scattering of the turbidity, so Lambert-Beer's law cannot be applied, and accurate chromaticity measurement is performed. Can not do. The effect of the turbid matter can be removed by measuring the sample filtered with the filter, but this does not take into account the light absorption component contained in the turbid matter. That is, when the solution looks colored, it is not possible to measure such a light-absorbing substance (colloidal substance) despite the fact that light absorption of the colloid particles may be a cause.

Next, regarding the turbidity measurement, the first method (measurement by transmitted light) is to perform accurate measurement because the amount of transmitted light varies depending on the amount of a soluble light-absorbing substance, if present. Can not. Also, even if the amount of soluble light absorbing substance is constant, if the colloid component increases, the substantial optical path length of the scattered light becomes longer due to the effect of multiple scattering, and the light absorption derived from the soluble light absorbing substance also increases. Measurement is not possible. For example, turbidity may be defined by including a soluble light-absorbing substance in a colloidal substance.

In the second method (measurement by scattered light), similarly to the first method, the scattered light intensity changes due to the influence of the soluble light-absorbing substance, and the change in the scattered light intensity derived from the colloid component and the soluble light-absorbing substance change. The scattered light intensity change due to the turbidity cannot be handled independently, and the turbidity cannot be accurately measured. In the third method (integrating sphere method), the influence of the light absorbing substance is smaller than in the first and second methods, but when the colloid component increases, the optical path length of the transmitted light is almost constant. Due to the multiple scattering, the substantial optical path length of the scattered light is lengthened, and again the influence of the soluble light-absorbing substance makes it impossible to perform an accurate measurement.

Here, the behavior of the light irradiated into the solvent will be considered in more detail. The incident photons are firstly absorbed with a certain probability by the light absorbing substance dissolved in the solvent, but the unabsorbed photons encounter the colloid particles with a certain probability and are scattered or absorbed. The above process of scattered photons changing direction with a certain probability is repeated, and only photons not absorbed until the end are detected. The amount of light detected is proportional to the probability that a photon will reach the detector without being absorbed to the end.

Concentration of scattering component (concentration of colloidal substance)
When the concentration of the soluble light-absorbing substance is increased without changing the optical path length distribution, even if the concentration of the scattering component is not changed, if the absolute value of the concentration of the scattering component is different, the optical path length distribution will be the same distribution. No. Since the probability of absorption of a photon due to the absorption of a soluble substance is proportional to the optical path length, increasing the concentration of the absorption substance decreases the number of photons that have passed through a long optical path. Since the manner of this reduction depends on the optical path length distribution, if the absolute value of the concentration of the scatter component is different, the manner of the reduction is also different. That is, the rate of change of the amount of light measured when the concentration of the light absorbing substance is increased, even if the concentration of the scattering component is constant.
It changes when the absolute value is different.

Next, when the concentration of the scattering component is changed without changing the concentration of the light absorbing component (including the concentration of the light absorbing component of the colloidal substance and the concentration of the light absorbing component of the soluble substance), a certain detection position is reached. The optical path length of the photon becomes longer as the degree of scattering becomes stronger due to the influence of multiple scattering. Therefore, even with the same concentration of the light absorbing component, the absorption probability increases as the scattering increases. Further, since the optical path length distribution also changes according to the change in the concentration of the scattering component, the amount of light detected is not proportional to the concentration of the scattering component.

The following is a case where the concentration of the colloidal substance (including the concentration of the light absorbing component of the colloidal substance and the concentration of the scattering component) is changed without changing the concentration of the soluble light absorbing component. Since both the component concentration (the concentration of the light-absorbing component of the colloidal substance and the concentration of the light-absorbing component of the soluble substance) and the concentration of the scattering component are different, the amount of light detected is further complicated, and the scattering component Not proportional to concentration.

Summarizing the above, the conventional measuring method is based on a change in the amount of light resulting from a change in the concentration of the light-absorbing component (the concentration of the light-absorbing component of the colloidal substance and the concentration of the light-absorbing component of the soluble substance), and the concentration of the scattering component (colloidal The change in the amount of light resulting from the change in the concentration of the scattered component of the substance cannot be independently evaluated, and the change in the concentration of the colloidal substance (the concentration of the light-absorbing component and the concentration of the scattered component of the colloidal material) cannot be evaluated. And the change in the amount of light resulting from the change in the concentration of the soluble light-absorbing substance cannot be measured independently. Therefore, when detecting the chromaticity and turbidity of the solvent to be measured, including both the turbidity (colloidal scattered light-absorbing substance) and the soluble light-absorbing substance, it is necessary to accurately determine which one is derived from the above. The problem is that you can't.

[0020]

[Means for Solving the Problems] The intensity of the light transmitted and scattered through the solvent containing both the soluble absorbing substance and the colloidal substance is measured by the absorption cross section (absorption coefficient) per unit volume of the solvent to be measured and the scattering per unit volume of the solvent to be measured. After converting into a cross-sectional area (scattering coefficient), the absorption coefficient of the measured solvent is measured as corresponding to chromaticity, and the scattering coefficient of the measured solvent is measured as corresponding to turbidity. These conversion methods can be performed by an apparatus having an operation unit storing a conversion table in which the light intensity is calculated by solving the transport equation.

2. Both soluble absorbing material and a colloidal substance
The intensity of light transmitted and scattered through the measured object including the two is converted into an absorption coefficient and a scattering coefficient. Next, the solvent to be measured is filtered through a filter, the attenuation of transmitted light is measured, and converted into a partial absorption coefficient of the solvent to be measured due to the soluble component. Then, the partial absorption coefficient due to the soluble component is subtracted from the absorption coefficient of the solvent to be measured to determine the partial absorption coefficient due to the colloid component. By multiplying the partial absorption coefficient due to the soluble component, the partial absorption coefficient due to the colloid component, the scattering coefficient of the solvent to be measured, the result of mutual addition and subtraction, and the concentration conversion coefficient of the standard substance, Chromaticity and turbidity can be determined.

[0022]

The absorption cross section (absorption coefficient) per unit volume of the solvent is proportional to the amount of light absorbing substance, and the scattering cross section (scattering coefficient) per unit volume of the solvent is proportional to the amount of light scattering substance. When the absorption coefficient and the scattering coefficient are used as the definitions of chromaticity and turbidity, respectively, these two physical quantities are independent of each other and do not interfere with each other.

The measurement of the absorption coefficient and the scattering coefficient of the solvent to be measured cannot be performed directly, but they can be related to the absorption coefficient and the scattering coefficient by a transport equation. Thus, by preparing these conversion tables in advance, the absorption coefficient and the scattering coefficient can be obtained from the measurement of the transmitted light intensity and the scattered light intensity of the measured solvent.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. For the solvent to be measured including the colloidal substance, light is scattered only by the colloidal component, but light is absorbed by both the soluble component and the colloidal component. Therefore, the concentration of the light-absorbing substance as an index of chromaticity, as appropriate to consider the concentration of the scattering substance as an index of turbidity, in measuring the chromaticity and turbidity of the solvent to be measured, the present inventors, The following considerations were made.

Assuming that the solvent is a homogeneous substance, the existence probability of the scattering substance and the existence probability of the light absorbing substance in an infinitesimal volume of the homogeneous substance are proportional to the scattering probability and the absorption probability in an infinitesimal volume, respectively. . The scattering probability per unit space is proportional to the scattering cross section per unit space, and the absorption probability per unit space is proportional to the absorption cross section per unit space. The scattering cross section and absorption cross section are originally indicators of the light scattering intensity and light absorption intensity of a single fine particle, and are defined as the ratio of the energy loss due to scattering and absorption to the energy incident per unit time per unit cross section. can do. Here, the scattering cross section per unit space is the sum of the scattering cross sections of all colloid particles divided by the space volume (the dimension is the reciprocal of distance), and the absorption cross section per unit space is The sum of the absorption cross section of the particle and the absorption cross section of all soluble light absorbing substances is divided by the space volume (the dimension is the reciprocal of the distance), and the scattering cross section per unit space of the substance is called the scattering coefficient. The absorption cross section per unit space is called an absorption coefficient. In summary, the concentration of the colloidal substance is proportional to the concentration of the scattering substance and proportional to the scattering coefficient. The concentration of the light absorbing substance is proportional to the absorption coefficient.

Given the scattering coefficient and absorption coefficient of the medium, and the shape and light source of the medium, the amount of transmitted and scattered output light can be obtained by solving the following transport equation.

[0027]

(Equation 1)

Here, μ _a : absorption coefficient μ _s : scattering coefficient L (r, Ω): unit area, unit time at unit r, energy dμ _s (r, Ω ′ →) per unit solid angle dΩ toward direction Ω Ω): Probability of scattering in the direction Ω from the direction Ω ′ at the position r s (r, Ω): light source.

This equation can be generally solved using the Monte Carlo method. If scattering is dominant,
It can also be solved using the diffusion approximation method. FIG. 1 is a schematic diagram showing a main configuration of an apparatus to which the method of the present invention is applied.
The same parts as those in FIG. 3 are represented by the same reference numerals. FIG.
, The light 2 from the light source 1 is converged by the lens 9,
The solvent 3 to be measured held in the rectangular optical cell 4 is irradiated and the intensity of the transmitted light 5 is measured by the first photodetector 10a, while the intensity of the scattered light 7 is measured by the second photodetector. Measure at 10b. The measured data of the transmitted light intensity and the scattered light intensity are sent to the calculation unit 11, and the calculation unit 11 stores conversion tables shown in Tables 1 and 2 calculated in advance by the transport equation.

Table 1 shows the scattering coefficient μ written in the vertical direction.
and _s, represent the transmitted light intensity corresponding to each of the coefficient of absorption coefficient mu _a filled out laterally, in which Table 2 represents the scattered light intensity in the same manner.

[0031]

[Table 1]

[0032]

[Table 2] The data of the transmitted light intensity and the scattered light intensity transmitted to the arithmetic unit 11 as described above can be converted into an absorption coefficient and a scattering coefficient by searching this conversion table.
After multiplying the absorption coefficient of the solvent to be measured as the output of the chromaticity and the scattering coefficient of the solvent to be measured as the output of the turbidity by the concentration conversion coefficient to the standard substance, the display device 12 can display the result.

It should be noted that in the above process, the absorption coefficient and the scattering coefficient are independent of each other because they are constant values possessed by the substance.
And the ability to cause the absorption of soluble light-absorbing substances.
Since it is proportional to the concentration of the total light-absorbing substance, it is appropriate for defining chromaticity. On the other hand, the scattering coefficient can be regarded as the ability to cause scattering of the colloidal component, and the concentration of the colloidal substance (concentration of the scattering component) ), It is appropriate for defining turbidity.

Further, the present inventors have made the following considerations in carrying out the present invention. As described above, chromaticity is an index of the light-absorbing substance concentration, the light-absorbing substance has a soluble light-absorbing component and a colloidal light-absorbing component, and the turbidity is an index of the colloidal substance. Has both a scattering component and a light absorption component. Therefore, considering the three components of the solvent for convenience, namely, the concentration of the soluble light-absorbing component, the concentration of the colloidal light-absorbing component, and the concentration of the colloidal scattering component, these are independent of each other and are very convenient for performing component analysis. Absorption coefficient is (+)
And the scattering coefficient is proportional to

In the measurement method of the present invention described above, of the chromaticity (+) due to the total light-absorbing substance, it is not possible to distinguish between the colloid component-derived () and the soluble component-derived (). When the absorbance of the medium obtained by filtering the medium is measured, the absorbance derived from the soluble component is quantified, and the chromaticity derived only from the soluble light-absorbing substance is obtained. Then, the chromaticity derived from the colloid component can be obtained by subtracting the chromaticity derived from the soluble component from the chromaticity derived from the total light-absorbing substance by using the above-described measurement method of the present invention.

FIG. 2 is a schematic diagram showing a main configuration of an apparatus to which the method of the present invention is applied based on such a concept. In FIG. 2, the solvent 3 to be measured is diverted by a valve 13, one of which is held as it is in an optical cell 4a (first measuring unit), and the other is filtered by a filter 14 and then held in another optical cell 4b. (Second measuring unit).

Solvent 3 to be measured held in optical cell 4a
In the same manner as shown in FIG. 1, after the light from the light source 1a is converged by the lens 9a, the light is irradiated on the solvent 3 to be measured, and the intensity of the transmitted light 5a is measured by the first photodetector 10a. , The intensity of the scattered light 7 is measured by the second photodetector 10b. The obtained transmitted light intensity and scattered light intensity are sent to the calculation unit 11a, and the absorption coefficient and the scattering coefficient of the measured solvent 3 are calculated using the conversion tables shown in Tables 1 and 2 stored in the calculation unit 11a. (First step).

The solvent 3 to be measured held in the optical cell 4b converges the light 2b from the other light source 1b by the lens 9b, and then irradiates the solvent 3 to be measured, thereby reducing the intensity of the transmitted light 5b. The measurement is performed by the third photodetector 10c and sent to the calculation unit 11b. In the calculation unit 11b, the transmitted light intensity can be converted into a partial absorption coefficient derived only from the soluble light-absorbing substance by the Lambert-Beer calculation formula (second process).

Then, the partial absorption coefficient derived from the soluble component is subtracted from the absorption coefficient obtained by measuring the solvent 3 not filtered by the filter 14 to obtain the partial absorption coefficient derived from the colloid component. (Third step). The chromaticity output is obtained by adding or subtracting the absorption coefficient including the solvent 3 to be measured filtered by the filter 14 and the scattering coefficient to obtain a partial absorption coefficient derived from a soluble component, a partial absorption coefficient derived from a colloid component, and a total absorption material. After multiplying the three derived absorption coefficients by the concentration conversion coefficient for the standard substance, the absorption coefficient is displayed on the display device 12.

Similarly, the output of the turbidity is output to the filter 14.
Addition or subtraction of the absorption coefficient and the scattering coefficient including the solvent 3 to be measured filtered in the above step, and adding the scattering coefficient (turbidity derived from the scattering component of the colloidal substance), the scattering coefficient and the partial absorption coefficient derived from the colloidal component. (Turbidity derived from colloidal substance) and the sum of the scattering coefficient and the absorption coefficient (turbidity derived from total scattered light-absorbing substance) are multiplied by the concentration conversion coefficient to the standard substance, and then displayed on the display device 12. indicate.

It should be noted that the scattered light described in this embodiment includes reflected light as a special case.

[0042]

As described above, according to the present invention, when the chromaticity and turbidity of a solvent to be measured containing both a turbid substance and a soluble light-absorbing substance are measured, the change in the concentration of the turbid substance and the solubility of the turbid substance are measured. It has become possible to independently measure the change in the concentration of the active light-absorbing substance. Chromaticity can be measured separately from chromaticity derived from soluble components, chromaticity derived from colloidal components, and chromaticity derived from total light-absorbing substances.Turbidity is turbidity derived from scattering components of colloidal substances. The turbidity derived from the scattering and absorption of the colloidal substance and the turbidity derived from the total scattered light-absorbing substance can be measured independently.

From the above, the method and apparatus of the present invention can provide extremely accurate and detailed results for the measurement of the chromaticity and turbidity of the solvent to be measured as compared with the conventional method.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a main configuration of an apparatus to which a method of the present invention for obtaining an absorption coefficient and a scattering coefficient of a solvent to be measured is applied.

FIG. 2 is a schematic diagram showing a configuration of a main part of an apparatus to which the method of the present invention capable of independently measuring an absorption component and a scattering component of a solvent to be measured is applied.

FIG. 3 shows three conventional turbidity measurement methods, (a) is a transmitted light detection method, (b) is a scattered light detection method,
(C) is a schematic diagram showing the integrating sphere method.

[Explanation of symbols]

 Reference Signs List 1 light source 1a light source 1b light source 2 light 2a light 2b light 3 solvent to be measured 4 optical cell 4a optical cell 4b optical cell 5 transmitted light 5a transmitted light 5b transmitted light 6a light receiver 6b light receiver 7 scattered light 8 integrating sphere 9 lens 9a lens 9b Lens 10a First photodetector 10b Second photodetector 10c Third photodetector 11 Operation unit 11a Operation unit 11b Operation unit 12 Display device 13 Valve 14 Filter

Continuation of the front page (56) References JP-A-58-195140 (JP, A) JP-A-6-123702 (JP, A) JP-A-57-74638 (JP, A) JP-A-4-9746 (JP) , A) M. R. Arnfield, J .; Tu lip, M .; S. McPhee, Opt ical Propagation i n Tissue with Anis otropic Scatterin g, IEEE Transaction s on Biomedical En gineering, the United States, Vol. 35, No. 5, 372-381 (58) investigated the field (Int.Cl. ^7, DB name) G01N 21/00-21/61 IEEE Xplore

Claims (8)

(57) [Claims] 1. A solvent to be measured containing both a soluble absorbing substance and a colloidal substance is irradiated with a light beam, and the chromaticity and turbidity of the solvent to be measured are measured from the intensity of light transmitted and scattered through the solvent to be measured. A method of converting the transmitted and scattered light intensities into an absorption cross section per unit volume (absorption coefficient) of the measured solvent and a scattering cross section (scattering coefficient) per unit volume of the measured solvent. A method for measuring the chromaticity and turbidity of a solvent containing a colloidal substance, wherein the chromaticity and turbidity are measured by multiplying the concentration conversion coefficient of the substance. 2. The method according to claim 1, wherein the conversion into the absorption coefficient and the scattering coefficient is performed by referring to a conversion table in which the transmission and scattering light intensities for various absorption and scattering coefficients are calculated by solving the transport equation. A method for measuring the chromaticity and turbidity of a solvent containing a colloidal substance. 3. A solvent to be measured containing both a soluble absorbing substance and a colloidal substance is irradiated with a light beam, and the chromaticity and turbidity of the solvent to be measured are measured from the intensity of light transmitted and scattered through the solvent to be measured. An optical cell containing a solvent to be measured, a light source for irradiating the solvent to be measured, a first photodetector for measuring a light intensity transmitted through the solvent to be measured, and a light intensity scattered from the solvent to be measured. A second photodetector for measuring the light intensity, the obtained light intensities are converted into an absorption cross section per unit volume (absorption coefficient) of the measured solvent and a scattering cross section (scattering coefficient) per unit volume of the measured solvent. An apparatus for measuring the chromaticity and turbidity of a solvent containing a colloidal substance, comprising a calculation unit for converting and a display device. 4. An apparatus according to claim 3, wherein the transmission equation is solved for various absorption and scattering coefficients.
An apparatus for measuring the chromaticity and turbidity of a solvent containing a colloidal substance, comprising an operation unit storing a conversion table for calculating the scattered light intensity. 5. A solvent to be measured containing both a soluble absorbing substance and a colloidal substance is irradiated with a light beam, and the chromaticity and turbidity of the solvent to be measured are measured from the intensity of light transmitted and scattered through the solvent to be measured. A first method of converting the intensity of transmitted and scattered light into an absorption cross section per unit volume (absorption coefficient) of the measured solvent and a scattering cross section (scattering coefficient) per unit volume of the measured solvent. A second step of converting the transmitted light attenuation from the intensity of light transmitted and scattered through the solvent to be measured filtered through the filter into a partial absorption coefficient of the solvent to be measured due to the solubility component of the solvent to be measured; and A third step of subtracting a partial absorption coefficient caused by the soluble component from an absorption coefficient of the solvent to obtain a partial absorption coefficient of the measured solvent caused by the colloid component; Partial absorption coefficient due to The color of a solvent containing a colloidal substance is characterized by measuring the chromaticity and turbidity by multiplying the partial absorption coefficient due to the id component or the result of addition and calculation of these, and the concentration conversion coefficient of the standard substance further. And turbidity measurement methods. 6. The method according to claim 5, wherein the conversion into the absorption coefficient and the scattering coefficient in the first step calculates the transmitted and scattered light intensities for various absorption and scattering coefficients by solving a transport equation. A method for measuring the chromaticity and turbidity of a solvent containing a colloidal substance, wherein the conversion into the partial absorption coefficient in the second step is performed by referring to a conversion table, wherein the conversion is performed using Lambert-Beer's law. . 7. A solvent to be measured containing both a soluble absorbing substance and a colloidal substance is irradiated with a light beam, and the chromaticity and turbidity of the solvent to be measured are measured from the intensity of light transmitted and scattered through the solvent to be measured. An optical cell containing a solvent to be measured, a light source for irradiating the solvent to be measured, a first photodetector for measuring a light intensity transmitted through the solvent to be measured, and a light intensity scattered from the solvent to be measured. A second photodetector that measures the light intensity, converts the obtained light intensities into an absorption cross section per unit volume (absorption coefficient) and a scattering cross section per unit volume (scattering coefficient) of the measured solvent. A first measuring unit having an operation unit for performing the measurement, an optical cell containing the solvent to be measured filtered, a light source for irradiating the solvent to be measured, and a third light detection for measuring the intensity of light transmitted through the solvent to be measured. Calculator for converting to the partial absorption coefficient of the solvent to be measured The second measuring unit comprises, and first, colloidal matter solvents including chromaticity and characterized in that it comprises a common display device in the second measuring section, turbidity measurement apparatus. 8. The apparatus according to claim 7, wherein a conversion table in which the transmitted and scattered light intensities for various absorption coefficients and scattering coefficients are calculated by the solution of the transport equation is stored in the arithmetic unit belonging to the first measuring unit. A chromaticity and turbidity measuring device for a solvent containing a colloidal substance, wherein a Lambert-Beer calculation formula is stored in a calculation unit belonging to the second measurement unit.