SU1479852A1 - Method of quantitative determination of copolymers of (met)acryiic acid in mineralized water - Google Patents

Abstract

The invention relates to the chemistry of polymers and can be used for the analysis of pollution of aquatic sources of the environment. The proposed method allows determining the amount of (meth) acrylate copolymers in highly mineralized water in the presence of complex metal compounds with an error not exceeding 2%, which is achieved by using a 0.1% alkaline fuchsine solution as a complexing agent and performing photometric measurement of the sample at PH 6, 1, created with a 0.2 M alkaline solution of potassium bphthalate. 5 tab., 1 Il.

Description

The invention relates to the analytical chemistry of polymers, in particular to a method for the quantitative determination of copolymers of (meth) acrylic acid in saline water, and can be used to control environmental pollution.

The aim of the invention is to improve the accuracy and selectivity of the determination.

The drawing shows a calibration graph of the dependence of optical density (D) on the concentrations (C) of the copolymers. The determination of (meth) acrylates in water is carried out using the function of the function function as the complexing agent, which is prepared as follows. 1 g of fuchsin is dissolved in 20 ml of distilled water, 10 ml of 2N is added. sodium or potassium hydroxide solution. After 10 minutes, the precipitated base of n-rosaniline is filtered off, and a saturated solution (0.1%) is used in the analysis.

Bringing the pH of the sample to be determined to 6.1 is carried out with a 0.2 M solution of potassium bphthalate (4.85 g of potassium bphthalate or dissolved in 100 ml of 0.1N sodium hydroxide solution).

As determined copolymers of (meth) acrylic acid, USE metas, reagent K-4, acrylic thickener, methacryl.

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Metas - a copolymer of methacrylamide and methacrylic acid (TU-6-01-254- 74)

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It is a white powder obtained by the suspension method. It is dissolved in water in unlimited quantities.

Formula K-4 is a viscous mass that dissolves well in water, is a copolymer of methacrylamide and methacrylic acid (TU-6-03-23-01-76)

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Water-soluble acrylic thickener (VAZ) (TU-6-01-2-716-84) refers to copolymers of methacrylamide and methacrylic acid based on monoethanolamine. It is a white powder with a weak aromatic odor.

For the preparation of model solutions, 10 mg of these copolymers are dissolved in 100 ml of distilled water.

Example 1. 100 ml of a previously prepared model solution of a copolymer in water (concentration 0.1 mg, pH 4.5) are placed in a 100 ml porcelain dish and evaporated to dryness in a water bath. The dry residue is dissolved in 10 ml of distilled water and transferred to a 15 ml test tube, to which 0.5 ml of 0.1% n-fuchsin and 0.5 ml of a 0.2 M alkaline solution of potassium biphthalate are added (pH 6.1). The contents of the test tubes are mixed and heated in a water bath at 130 ° C for 10 minutes. After cooling to room temperature, the optical density of the solution was measured on a photocolorimeter (for example, KF-2) at a wavelength of 530 nm using a cuvette with a working layer thickness of 10 mm. The amount of copolymer is 1 mg / dm1 (determined from the calibration graph shown in the drawing).

Examples 2-7. All operations are similar to example 1.

The data in examples 2-7 are given

R table.1.

Try on All operations were carried out as in Example 1, using 0.5 ml of a 0.1% fuchsin solution and 0.5 ml of a 0.05 M solution of potassium bphthalate.

Examples 9-20. All operations are similar to example 8.

The data in examples 8-20 are given in table 2, the data on the definition of copolymers of (meth) acrylic acid in natural waters in table. 3-5 (examples 21-28).

Claims (1)

Invention Formula The method of quantitative determination of copolymers of (meth) acrylic acid in saline water by treating a sample of water with a complexing reagent, subsequent photometric measurement of the optical density of the solution and determining the concentration of copolymers using a calibration curve, characterized in that, in order to increase the accuracy and selectivity of the determination, a 0.1% alkaline solution of fuchsin is used as a complexing agent, and the photometric measurement is carried out at a pH of 6.1 in the presence of a 0.2 M alkaline solution of potassium bifthalate. Table 1  - The average of five independent definitions. T "0 l and c and 2 1479852 8 Continuation of table 3 Editor L. Veselovsky Compiled by V. Paul Kova Tehred I. Veres Corrector. Kravtsov Order 2536/42 Circulation 790 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 in w C, mg / l Subscription