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Method for measuring trace quantity of prussiate in water by using dual-wavelength superposition spectrophotometry

A technique of spectrophotometry and cyanide, applied in the direction of color/spectral characteristic measurement, etc.

Inactive Publication Date: 2011-11-30
吴佑琼
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Problems solved by technology

The national standards for the determination of trace cyanide in surface water and drinking water mainly include the isonicotinic acid-pyrazolone photometric method, isonicotinic acid-barbituric acid photometric method and pyridine-barbituric acid photometric method. However, the determination of trace cyanide in water by isonicotinic acid-thiobarbituric acid dual-wavelength superposition spectrophotometry has not been reported in the literature

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  • Method for measuring trace quantity of prussiate in water by using dual-wavelength superposition spectrophotometry
  • Method for measuring trace quantity of prussiate in water by using dual-wavelength superposition spectrophotometry
  • Method for measuring trace quantity of prussiate in water by using dual-wavelength superposition spectrophotometry

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Embodiment

[0017] 1. Main instruments and reagents:

[0018] UV-Vis Spectrophotometer: TU-1810SPC, Beijing Puxi General Instrument Co., Ltd.;

[0019] Cyanide standard solution: 0.10 mg / mL (accurate concentration is calibrated by silver salt method), diluted with 0.05 mol / L NaOH to 1.0 μg / mL before use; 0.05 mol / L potassium dihydrogen phosphate / sodium hydroxide buffer solution : pH 5.8;

[0020] Isonicotinic acid-thiobarbituric acid solution: Weigh 2.0 g of thiobarbituric acid and 2.5 g of isonicotinic acid, add 28-30 mL of 1.0 mol / L NaOH solution, stir to dissolve, and then dilute with pure water. Make up to 100 mL (the pH of this solution is near neutral);

[0021] Chloramine T solution: 10.0 g / L, prepared just before use;

[0022] NaOH solution; 0.50, 0.05 mol / L;

[0023] Acetic acid solution (3+97);

[0024] 1.0 g / L phenolphthalein indicator;

[0025] The above reagents were of analytical grade, and the experimental water was ultrapure water (18.25 MΩ·cm).

[0026] 2. Determin...

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Abstract

The invention discloses a method for measuring trace quantity of prussiate in water by using dual-wavelength superposition spectrophotometry. Under the condition that chloramine T exists in a weak acid medium, the prussiate and isonicotinic acid-thiobarbituric acid form red-blue dye which has a principle of dual absorption peaks; a novel method for measuring the trace quantity of prussiate in water through experiment, namely the isonicotinic acid-thiobarbituric acid dual-wavelength superposition spectrophotometry is established and provides a simple, convenient and sensitive analyzing method for measuring the trace quantity of prussiate in a water sample; and meanwhile, the application range of thiobarbituric acid is widened.

Description

technical field [0001] The invention relates to a method for measuring trace cyanide in water. Background technique [0002] Natural water generally does not contain cyanide (CN - ), cyanide mainly comes from industrial pollution. After cyanide enters the human body, it combines with cytochrome oxidase, causing people to die quickly due to lack of oxygen. Therefore, cyanide is used as one of the toxicological indicators for water quality monitoring. The limit of cyanide is stipulated in the environmental quality standard for surface water (Class III) and the hygienic standard for drinking water as 0.20 mg / L and 0.05 mg / L respectively. The national standards for the determination of trace cyanide in surface water and drinking water mainly include the isonicotinic acid-pyrazolone photometric method, isonicotinic acid-barbituric acid photometric method and pyridine-barbituric acid photometric method. However, the determination of trace cyanide in water by isonicotinic acid-th...

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Application Information

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IPC IPC(8): G01N21/31G01N21/33
Inventor 吴佑琼
Owner 吴佑琼
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