Improved spectrophotometry for phosphorus pentoxide ammonium molybdate

A technology of ammonium diphosphomolybdate pentoxide and spectrophotometry, which is applied in the measurement of color/spectral characteristics, etc., can solve the problem of low sensitivity and achieve high sensitivity, wide application range and good reproducibility

Inactive Publication Date: 2015-07-15
ZHEJIANG ZHENGAN DETECTION TECH CO LTD
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  • Abstract
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Problems solved by technology

[0007] In order to overcome the deficiencies in the background technology, the invention provides an improved ammonium diphosphomolybdate spectrophotometric method, which mainly solves the problem of low

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  • Improved spectrophotometry for phosphorus pentoxide ammonium molybdate
  • Improved spectrophotometry for phosphorus pentoxide ammonium molybdate

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Embodiment Construction

[0023] Embodiments of the present invention will be further described below in conjunction with accompanying drawings:

[0024] Such as figure 1 Shown, a kind of improved ammonium diphosphomolybdate spectrophotometry, it may further comprise the steps:

[0025] (1) Preparation of sulfuric acid solution: 2.5 mol / L

[0026] Measure 14.4ml of ρ= 1.84 g / ml sulfuric acid with a graduated cylinder, slowly (while stirring) pour it into about 50 ml of water, transfer it to a 100 ml volumetric flask, and dilute with water to the marked line;

[0027] (2) Preparation of ammonium molybdate solution: 50g / L

[0028] Take by weighing 2.5 g ammonium molybdate, be dissolved in the 2.5 mol / L sulfuric acid of 50 ml;

[0029] (3) Preparation of hydrazine sulfate solution: 15g / L

[0030] Weigh 1.5g of hydrazine sulfate and dissolve in 100ml of distilled water;

[0031] (4) Preparation of phosphorus pentoxide standard solution:

[0032] Accurately weigh 0.2454g of dried dipotassium hydrog...

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Abstract

The invention relates to an improved spectrophotometry for phosphorus pentoxide ammonium molybdate. With the adoption of the improved spectrophotometry, the problem of low sensitivity of the existing determination method for the phosphorus pentoxide is mainly solved. The improved spectrophotometry is characterized by comprising the following measures: firstly, preparing standard phosphorus-pentoxide solution; secondly, taking six 50ml color-comparison tubes with stoppers, respectively adding the standard phosphorus pentoxide solution into the color-comparison tubes by 0.0ml, 2.5ml, 5.0ml, 10.0ml, 15.0ml and 20.0ml, adding 0.5ml sulfuric acid solution, 0.5ml ammonium molybdate solution and 2.0ml hydrazine sulfate solution, putting in a boiling water bath for 10 minutes, then taking out, and cooling to the room temperature; measuring the absorbancy under the 680nm wavelength, drawing a standard curve, and calculating a linear regression equation thereof; and then determining the absorbancy of the sample and calculating the recovery rate of standard addition. The improved spectrophotometry has the advantages of wide application range, simple steps, high sensitivity and good reproducibility.

Description

technical field [0001] The invention relates to a method for determining phosphorus pentoxide, in particular to an improved spectrophotometric method for ammonium diphosphomolybdate. Background technique [0002] Phosphorus pentoxide is formed by the combustion of phosphorus in oxygen, with the chemical formula P 2 o 5 , white amorphous powder or hexagonal crystal, very easy to absorb moisture, sublimates at 360°C, does not burn, dissolves in water to generate a lot of heat and generates phosphoric acid, reacts to ethanol similarly to water, is an acidic oxide and is corrosive, and cannot be used directly by hand Do not touch or eat, nor smell the smell directly. According to the " Regulations on the Safety Management of Hazardous Chemicals 》Under the control of the public security department. [0003] The routes of entry include inhalation, ingestion, and percutaneous absorption. [0004] Health hazards: poisoning manifestations and white phosphorus same. Acute poiso...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 余芳
Owner ZHEJIANG ZHENGAN DETECTION TECH CO LTD
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