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Determination method of phosphorus content

A determination method and technology for phosphorus content, which are applied in chemical analysis by titration, material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, etc., which can solve the problem of long operation time and easy generation. Error, cumbersome operation process and other problems, to achieve the effect of simple operation and improve test efficiency

Pending Publication Date: 2022-07-05
QUJING DYNANONIC CO LTD +1
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  • Claims
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Problems solved by technology

[0003] Among them, the test process of quinoline phosphomolybdate precipitation method needs to be heated, filtered and dried, and the operation time is long and the operation process is loaded down with trivial details; the ammonium phosphomolybdate titration method mainly adopts indirect acid-base titration method in the determination process, and in the preparation process , has strict requirements on operation and is prone to errors

Method used

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  • Determination method of phosphorus content
  • Determination method of phosphorus content
  • Determination method of phosphorus content

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Embodiment 1

[0026] The present embodiment provides a method for measuring phosphorus content, comprising the following steps:

[0027] (1) Sample test: take 0.3017g of ammonium dihydrogen phosphate sample (purity 99%), rinse with water until completely dissolved, add 2 drops of 30% ammonia solution, use NH 3 -NH 4 Cl buffer solution, adjust the pH to 9.8, add 3 drops of chrome black T solution (concentration 10g / L), titrate with 0.1015mol / L magnesium sulfate solution, observe that the color of the solution changes from blue to no more precipitation, and the color of the solution is When the wine turns red, stop the titration, and the volume of magnesium sulfate solution consumed is 25.61 mL;

[0028] (2) Calculate the phosphorus content according to the following formula:

[0029]

[0030] Wherein, C1 is the molar concentration of magnesium sulfate solution, V1 is the volume of magnesium sulfate solution consumed in step (1), m is the sample mass consumed, and M is the molar mass of ...

Embodiment 2

[0032] This embodiment provides a method for determining phosphorus content, and the difference from Embodiment 1 is only that the weight of the ammonium dihydrogen phosphate sample (purity 99%) is 0.3126 g.

Embodiment 3

[0034] This embodiment provides a method for determining phosphorus content, and the difference from Embodiment 1 is only that the weight of the ammonium dihydrogen phosphate sample (purity 99%) is 0.3096 g.

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Abstract

The invention provides a phosphorus content determination method, which comprises: (1) dissolving a sample with a mass of m in water, adding a buffer solution, adjusting the pH value to 8-10, and adding a metal indicator to obtain a colored sample solution; (2) a magnesium salt solution with the molar concentration of C1 is added into the colored sample solution obtained in the step (1) through titration until the reaction endpoint, and the volume of the consumed magnesium salt solution is V1; (3) the phosphorus content P% is calculated according to a formula, the unit of C1 is mol / L, the unit of V1 is mL, the unit of m is g, M is the molar mass of phosphorus, and the unit is g / mol. The phosphorus content determination method provided by the invention is simple, rapid and accurate to operate, and can greatly improve the test efficiency on the premise of not influencing the test accuracy.

Description

technical field [0001] The invention belongs to the field of quantitative analysis of non-metallic elements, and particularly relates to a method for determining phosphorus content. Background technique [0002] In industrial production, phosphate is widely used in various industries. It is used as a raw material for production. Its phosphate content is high, and it is often used in conjunction with various metal / non-metal elements. The commonly used detection methods for phosphorus content include quinoline phosphomolybdate gravimetric method and ammonium phosphomolybdate precipitation titration method. The quinoline phosphomolybdate gravimetric method mainly uses quinomolybdate limonene as a precipitant, and reacts with orthophosphate in an acidic environment to form quinoline phosphomolybdate precipitation; the ammonium phosphomolybdate precipitation titration method mainly uses ammonium molybdate as a precipitant The method of generating ammonium phosphomolybdate precip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N21/78
CPCG01N31/16G01N21/78
Inventor 蔡芳芳吴卓欣王小静叶光英龚昊陈燕玉
Owner QUJING DYNANONIC CO LTD
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