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Method and kit for utilizing Mo-Sb antiluminosity method to detect content of orthophosphate in water

An orthophosphate and spectrophotometry technology, applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc. work and other problems, to achieve the effect of fast detection speed, convenient field operation, stability and less time-consuming

Inactive Publication Date: 2013-02-06
PEKING UNIV
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Problems solved by technology

[0006] All of the above methods can accurately measure the content of orthophosphate, but due to the need to prepare sulfuric acid solution for acidification, there are the following inconveniences in the actual operation process: first, sulfuric acid is a liquid acid with strong oxidizing properties, which is not suitable for long-term use. Distance transportation and carrying; secondly, the preparation of all solutions in the above methods needs to be completed in a fume hood, which is not suitable for field work

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  • Method and kit for utilizing Mo-Sb antiluminosity method to detect content of orthophosphate in water
  • Method and kit for utilizing Mo-Sb antiluminosity method to detect content of orthophosphate in water
  • Method and kit for utilizing Mo-Sb antiluminosity method to detect content of orthophosphate in water

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[0019] The present invention will be described in detail below in conjunction with specific examples, but the scope of the present invention is not limited in any way.

[0020] 1. Main instruments and reagents

[0021] Instruments: DR2800 visible spectrophotometer, XS105DU one hundred thousandth balance, one hundredth balance, ball mill, oscillator, heat sealer;

[0022] Reagents: Potassium dihydrogen phosphate, ammonium molybdate, potassium antimony tartrate, ascorbic acid, benzenesulfonic acid, concentrated sulfuric acid, ultrapure water. Reagents are analytically or chromatographically pure.

[0023] 2. Working curve and mixed developer

[0024] 1) Working curve: the experimental design water sample phosphorus concentration gradient is 0.00, 0.06, 0.30 and 0.60mg / L KH 2 PO 4 (calculated as pure P).

[0025] 2) Mix color developer: Weigh 5.2g ammonium molybdate, 0.14g antimony potassium tartrate and 10g ascorbic acid, grind them to about 200 mesh with a ball mill, mix t...

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Abstract

The invention discloses a method and kit for utilizing a Mo-Sb antiluminosity method to detect a content of orthophosphate in water. The method comprises blending ammonium molybdate, antimony potassium tartrate and ascorbic acid to make a color developing agent, adding the color developing agent into a to-be-measured water sample to blend the color developing agent, then adding benzene sulfonic acid to enable the pH to be 0-1, fully blending and standing for over 3min, utilizing a spectrophotometer to measure the absorbance at the position of 880nm, and obtaining the content of orthophosphate in the to-be-measured water sample through an absorbance value according to a pre-measured standard curve. According to the method, by improving a strong acid medium, operation in measuring orthophosphate in the Mo-Sb antiluminosity method is simplified, danger is lowered, the detection speed is improved, and field operation is facilitated.

Description

technical field [0001] The invention relates to a method for testing orthophosphate in water, in particular to a method for testing the content of orthophosphate in water by using molybdenum antimony anti-spectrophotometry. Background technique [0002] Phosphorus is an important indicator for evaluating water quality. At present, the common methods for determining the content of orthophosphate in water are as follows: [0003] Bismuth phosphomolybdenum blue-sulfuric acid spectrophotometry: In sulfuric acid medium, orthophosphate reacts with ammonium molybdate to generate phosphomolybdenum heteropoly acid in the presence of bismuth nitrate, which is reduced to a complex by ascorbic acid, and spectroscopically used at 750nm Photometric method for determination (Chu Zhishan et al. Bismuth phosphomolybdenum blue-sulfuric acid photometric method for the determination of phosphorus content. China, CN201010107255.X[P].2010-01-29). [0004] Molybdenum-antimony anti-spectrophotomet...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 刘文秀何伟王卿梅杨晨徐福留欧阳慧灵何玘霜蒋玉娇
Owner PEKING UNIV
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