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Method for preparing phosphorous detecting test paper

A technology of test paper and filter paper, which is applied in the field of chemical analysis, can solve the problems of complex fertilizer sample processing, etc., and achieve the effects of simple production, reduced test cost, and convenient operation

Inactive Publication Date: 2010-11-17
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is more complicated for the treatment of chemical fertilizer samples. It is necessary to add EDTA, nitric acid solution, ammonium molybdate solution, hydroquinone solution and sodium sulfite solid to the sample aqueous solution. However, it is impossible to use this method to determine the phosphorus content in fertilizers

Method used

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  • Method for preparing phosphorous detecting test paper

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Effect test

Embodiment 1

[0014] Prepare a solution containing 1.0 mg / mL antimony potassium tartrate, 30 mg / mL ammonium molybdate, and 30 mg / mL ascorbic acid, and immerse the quantitative filter paper in the solution for about 30 seconds. Take out the filter paper soaked in the solution based on the principle of soaking , dried at a temperature of 50°C, and sealed in plastic for later use. That is, it is made of potassium antimony tartrate 0.015mg / cm 2 , ammonium molybdate 0.04mg / cm 2 , ascorbic acid 0.04mg / cm 2 phosphorus test paper. Immerse the phosphorus test paper in the aqueous solution of the sample containing phosphate ions, take it out after 3 seconds, put it flat for 3 minutes, compare the color displayed on the test paper with the standard color card, and you can judge the concentration of phosphorus ions in the tested sample. Concentration, compare (seeing table 1) with the result that this test paper measures with the result that standard method measures, as seen from table 1, differ lit...

Embodiment 2

[0016] Prepare a solution containing 1.5 mg / mL antimony potassium tartrate, 50 mg / mL ammonium molybdate, and 50 mg / mL ascorbic acid, and immerse the quantitative filter paper in the solution for about 30 seconds. Take out the filter paper soaked in the solution based on the principle of soaking , dried at a temperature of 50°C, and sealed in plastic for later use. That is, it is made of potassium antimony tartrate 0.02mg / cm 2 , ammonium molybdate 0.07mg / cm 2 , ascorbic acid 0.07mg / cm 2 phosphorus test paper. Immerse the phosphorus test paper in the aqueous solution containing the phosphate ion sample, take it out after 3 seconds, and put it flat for 3 minutes, compare the color displayed on the test paper with the standard color card, and you can judge the phosphorus ion concentration of the tested sample. Concentration, compare (seeing table 1) with the result that this test paper measures with the result that standard method measures, as seen from table 1, differ little w...

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Abstract

The invention relates to a method for preparing phosphorous detecting test paper, and belongs to the field of chemical analysis. The phosphorous test paper consists of filter paper impregnated with antimony potassium tartrate, ammonium molybdate and ascorbic acid. Each one square centimeter of the filter paper contains 0.01 to 0.02 mg of the antimony potassium tartrate, 0.04 to 0.07 mg of the ammonium molybdate and 0.04 to 0.07 mg of the ascorbic acid. The used filter paper can be qualitative filter paper, quantitative filter paper or chromatography filter paper. The reagent content of the phosphorous test paper is only a few tenths to hundredths of the using amount of the reagent in other phosphorous ion detecting method, so that the testing cost is reduced greatly. The test paper has the advantage of simple preparation, convenient operation, high sensitivity and particular suitability for field and site operation, and the content of phosphate ions of a sample can be judged by visually comparing the colors of the test paper which develops the color and a standard color card, so that the test can be performed by non-professional personnel. The reagents used in the invention are common chemical reagents, and are nontoxic, safe and reliable; and the test paper has wide application range, and can be used for measuring the phosphorous content of various phosphate fertilizers, soil, crop hydroponics nutrient solution, various phosphorous-containing solution and sewage.

Description

technical field [0001] The invention relates to a rapid determination method of phosphorus in chemical fertilizers, in particular to a test paper for rapid detection of phosphate ion concentration in chemical fertilizers and a preparation method thereof, belonging to the field of chemical analysis. Background technique [0002] Phosphorus is an essential element for the growth of many plants. Determination of phosphorus content in soil and fertilizer is of great significance for rational fertilization. The harm caused by low-quality chemical fertilizers, especially fake chemical fertilizers, is well known, ranging from direct economic losses to farmers, to severe impacts on agricultural production. At present, the domestic quality testing of chemical fertilizers is mainly undertaken by quality and technical supervision departments at all levels, and the testing methods adopted are the national standards formulated in the 1980s and 1990s (GB / T 10207-88; GB / T 10512-1998; GB / T ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/22
Inventor 许崇娟李慧芝
Owner UNIV OF JINAN
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