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Method for measuring total phosphorus content in water

A measurement method and phosphorus content technology, applied in the direction of measuring device, color/spectral characteristic measurement, and material analysis through optical means, can solve the problems of inaccurate measurement accuracy and long measurement time, so as to improve detection accuracy and speed up digestion speed effect

Active Publication Date: 2020-11-10
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, the most common method for measuring total phosphorus content is molybdate spectrophotometry, but the method stipulated in GB11893-89 is still not accurate enough in measurement accuracy, and the measurement time is too long. Therefore, a measurement method is urgently needed Measuring method with short time and high precision

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  • Method for measuring total phosphorus content in water

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Effect test

Embodiment 1

[0027] Amount of phosphorus in the prior art including water insoluble and soluble forms of phosphates and various phosphorous-containing organic material, if measured TP do, phosphorus-containing organic material should be digested completely converted to soluble phosphate, also Xiaohua so metaphosphate and pyrophosphate converted to orthophosphate. And then with a strong acid solution with molybdate and potassium tartrate, antimony phosphomolybdate reaction heteropoly acid, at a certain pH, antimony phosphomolybdate heteropoly acid can be reduced to the blue reducing compound "molybdenum blue."

[0028] Employed in the prior art the amount of phosphorus present Spectrophotometry water problem that during spectrophotometry phosphate, the presence of a heteropolyacid molybdate phosphate having the generated two kinds of isomers AB problem, and two kinds of isomers absorbance difference is large, so that the final amount of phosphorus measured error larger water; to this end, the p...

Embodiment 2

[0041] Amount of phosphorus in the prior art comprises a water sample, digestion, preparation of standard solution, display, measurement, correction step, and in the digestion step, using potassium persulfate, typically takes about 30 minutes, and the digestion liquid in order to adjust PH value adding a small amount of hydrochloric acid, may also be added to increase the reaction speed of the reaction rate to accelerate a small amount of nitrate. The specific method is as follows:

[0042] Step (1): obtaining a sample to be detected and filtered, 25ml sample was taken graduated tube;

[0043]Step (2): Add 4 ml of potassium sulfate (50 g / l) solution to the sample, and add a small amount of hydrochloric acid to adjust the pH of 1 to 1, and then add 4-5 g of nitrate (potassium nitrate), will have a tube Plug with a plug, a tap bag, tightly tighten it; put the test tube in a large beaker, heating in a high pressure steam sterilizer, to be pressure to 1-1.1 kg / cm2, temperature is ...

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Abstract

The invention relates to a method for measuring the content of total phosphorus in water, and belongs to the technical field of environmental protection. Heteropolyacid generated by phosphate and molybdate has two isomers A and B, the absorbance difference of the two isomers is relatively larger, and according to the invention, two different wavelengths are adopted to measure absorbance so as to construct a binary linear equation set, and the purpose of accurate measurement is achieved by solving the equation set.

Description

Technical field [0001] The present invention relates to the field of environmental protection, particularly relates to a method of measuring an amount of phosphorus in the water. Background technique [0002] Phosphorus in water comprising: phosphorus, orthophosphates, condensed phosphates, pyrophosphate presence, metaphosphate, and organic groups bound phosphate and the like. The main source of sewage, chemical fertilizers, pesticides and organic detergents used in modern phosphate was clean and the like. Phosphates can interfere with the coagulation process waterworks. Water phosphorus is a key element required for growth of algae, is caused by an excess of phosphorus pollution of water smell, so that the main reason for the utterance lake eutrophication and red tide appears bay. Therefore, in environmental protection, it is important to measure the amount of phosphorus in the water. [0003] In the prior art, the most common method of measuring the content of total phosphorus ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/314
Inventor 徐晓轩王斌梁亦豪张月颖
Owner NANKAI UNIV