Method for measuring concentration of aniline in aqueous solution

An aqueous solution and concentration technology, which is used in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve problems such as narrow detection range and inability to solve, and achieve precision and accuracy. High, selectivity improvement, stable and reliable results

Inactive Publication Date: 2012-06-20
SHENYANG JIANZHU UNIVERSITY
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  • Abstract
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  • Claims
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Problems solved by technology

However, the detection range of this detection method is relatively narrow, and it cannot solve the common problems of applying the diazo coupling method-national standard method

Method used

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  • Method for measuring concentration of aniline in aqueous solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Reagent configuration: Aniline standard stock solution: 1mg / mL, take a certain amount of aniline and dissolve it in water, calculate to constant volume; dilute to 0.1mg / mL before use;

[0021] Chromogen: 10mg / mL ethanol aqueous solution of 1-naphthylamine, take 1000mg of 1-naphthylamine and dissolve it in 95% ethanol and make it 100mL;

[0022] 5mg / mL hydrochloric acid: 5mL concentrated hydrochloric acid diluted with water to 1000mL;

[0023] 1mg / mL sodium nitrite solution: Dissolve 1000mg sodium nitrite in water and make it 1000mL;

[0024] 10mg / mL ammonium sulfamate solution: Dissolve 1000mg ammonium sulfamate and make it 100mL.

[0025] Standard curve: take 0, 2, 4, 6, 8, 10 mL of 100 mg / L aniline solution, dilute to 100 mL, and obtain aniline solutions with concentrations of 0, 2, 4, 6, 8, 10 mg / L. Take 10 mL of this solution in a 25 mL volumetric flask, add 2.5 mL of hydrochloric acid solution and 2.5 mL of sodium nitrite solution successively, shake well, and le...

Embodiment 2

[0027] Take 1mL of the solution in a 25mL volumetric flask, add 10mL of hydrochloric acid solution with a concentration of 500mg / mL and 10mL of sodium nitrite solution with a concentration of 5mg / mL successively, shake well, and let stand for 10min; add 10mL of ammonium sulfamate solution with a concentration of 1mg / mL, Fully shake for 5 minutes until the air bubbles are removed to eliminate the influence of sodium nitrite on the determination; add 1mL of 100mg / mL ethanol aqueous solution of 1-naphthylamine, shake well, use distilled water to make up the volume, and after standing for 10min, a red or purple quinone form is formed. Dye, colorimetrically measure the absorbance of the sample at a wavelength of 500nm. Others are with embodiment 1.

Embodiment 3

[0029] Take 5mL of the solution in a 25mL volumetric flask, add 5mL of 350mg / mL sulfuric acid solution and 5mL of 10mg / mL sodium nitrite solution successively, shake well, and let stand for 1min; add 5mL of 50mg / mL ammonium sulfamate solution, fully Shake for 10 minutes until all the bubbles are removed to eliminate the influence of sodium nitrite on the determination; add 5 mL of 1-naphthylamine in 1 mg / mL ethanol solution, shake well, dilute with distilled water, and let it stand for 1 minute to form a red or purple quinone dye , Measure the absorbance of the sample colorimetrically at a wavelength of 550 nm. Others are with embodiment 1.

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Abstract

The invention discloses a method for measuring the concentration of aniline in the aqueous solution, comprising the following steps: (a) adding 1-25ml of aqueous solution to a volumetric flask of 25-100ml, adding 1-10ml of acid solution and 1-10ml of sodium nitrite solution in sequence, shaking uniformly, and standing for 1-10min for later use; (b) adding1-10ml of amino sulfonic acid ammonium to the solution of later use, fully vibrating, and standing for 1-10min until the foams are eliminated to prevent the sodium nitrite from affecting the measurement; and (c) adding 1-10ml of chromogenic reagent into the prepared solution, shaking uniformly, metering the volume by using distilled water, standing for 1-10min, and comparing color at the wavelength of 500-550nm. The method for measuring the concentration of aniline in the aqueous solution is simple, can obtain a stable and reliable measurement result with good repeatability, high degree of precision and high degree of accuracy and particularly can ensure that the stability of the chromogenic product is improved by more than 2 times, thereby being an ideal method for measuring the concentration of low-concentration aniline in industrial water and sewage water.

Description

technical field [0001] The invention relates to a method for measuring the concentration of aniline, in particular to a method for measuring the concentration of aniline in an aqueous solution. Background technique [0002] Anilines are important chemical raw materials in industries such as pharmaceuticals, dyes, and textiles. These substances are highly toxic and have obvious carcinogenic effects. Because of its great impact on the environment and human health, it is listed on the blacklist of fourteen types of environmental priority pollutants in my country. Therefore, the determination of aniline substances is a very important content in environmental monitoring. In the past, the determination of trace amounts of aniline in aqueous solution usually used naphthalene ethylenediamine azophotometry, which is the national standard method (GB11889-89). Since this method uses the azo dye generation method and the spectrophotometric method to determine aniline, not only because ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 牛明芬徐丽葛安东韦健
Owner SHENYANG JIANZHU UNIVERSITY
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