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Method for preparing mercury-free ammonium detection test paper

A test paper and filter paper technology, applied in the field of analytical chemistry, can solve the problems of environmental pollution, ignorance of the harm of mercury, harm to the human body, etc., and achieve the effects of cost reduction, intuitive detection, and wide application range.

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

AI Technical Summary

Problems solved by technology

The toxicity of mercury is well known, and its harm to the environment and the human body is irreversible. If mercury-containing test paper is used on a large scale, and users do not know the harm of mercury, it will bring very serious consequences.

Method used

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  • Method for preparing mercury-free ammonium detection test paper

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Experimental program
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Embodiment 1

[0015] Prepare solutions containing 35 mg / mL phenol, 0.2 mg / mL sodium nitroferricyanide, 25 mg / mL disodium hydrogen phosphate, 200 mg / mL sodium phosphate, 21 mg / mL sodium hypochlorite and 10 mg / mL sodium hydroxide , Immerse all the quantitative filter paper in the solution for about 30s, and take out the filter paper soaked in the solution based on the principle of soaking, and dry it at a temperature of 50°C. That is, it is made to contain phenol 0.5mg / cm 2 , sodium nitroferricyanide 0.003mg / cm 2 , disodium hydrogen phosphate 0.35mg / cm 2 , sodium phosphate 3.0mg / cm 2 , sodium hypochlorite 0.3mg / cm 2 , sodium hydroxide 0.15mg / cm 2 ammonium test paper. Immerse the ammonium test paper in the aqueous solution containing the ammonium ion sample, take it out after 2-5 seconds, and place it flat for 5 minutes. Compare the displayed color on this test paper with the standard color card, you can judge the concentration of the ammonium ion of the tested sample species, compare th...

Embodiment 2

[0017] Prepare solutions containing 100 mg / mL phenol, 1.5 mg / mL sodium nitroferricyanide, 100 mg / mL disodium hydrogen phosphate, 240 mg / mL sodium phosphate, 150 mg / mL sodium hypochlorite and 15 mg / mL sodium hydroxide , Immerse all the quantitative filter paper in the solution for about 30s, and take out the filter paper soaked in the solution based on the principle of soaking, and dry it at a temperature of 50°C. That is, it is made to contain phenol 1.4mg / cm 2 , sodium nitroferricyanide 0.02mg / cm 2 , disodium hydrogen phosphate 1.4mg / cm 2 , sodium phosphate 3.4mg / cm 2 , sodium hypochlorite 2.1mg / cm 2 , sodium hydroxide 0.20mg / cm 2 ammonium test paper. Immerse the ammonium test paper in the aqueous solution containing the ammonium ion sample, take it out after 2-5 seconds, and place it flat for 5 minutes. Compare the displayed color on this test paper with the standard color card, you can judge the concentration of the ammonium ion of the tested sample species, compare t...

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Abstract

The invention relates to a method for preparing mercury-free ammonium detection test paper, and belongs to the field of analytical chemistry. Based on filter paper of 1 square centimeter, the ammonium test paper consists of 0.5 to 5.6 milligrams of soaked phenol, 0 to 0.1 milligram of sodium nitroprusside, 0.35 to 4.5 milligrams of disodium hydrogen phosphate, 3.0 to 10 milligrams of sodium phosphate, 0.3 to 4.6 milligrams of sodium hypochlorite and 0.15 to 0.5 milligram of sodium hydroxide. The reagent content of the ammonium test paper is only one percent of that in other ammonium ion test methods. The test paper of the invention has the advantages of simple manufacturing, convenience to carry, simple, convenient and rapid operation, vivid detection, high selectivity and capability of judging the ammonium ion content of a sample by visually comparing the color of the developing test paper with that of a standard color card. Reagents used by the method are ordinary chemical reagents which are non-toxic, safe and reliable and can be used for testing the ammonium content of various nitrogen fertilizers, soil, crop hydroponics nutrient solution, different kinds of ammonium-containing solution and sewage.

Description

technical field [0001] The invention relates to a method for preparing a mercury-free test paper for detecting ammonium, in particular to a test paper for rapidly detecting ammonium concentration in chemical fertilizers and a preparation method thereof. belongs to the field of analytical chemistry. Background technique [0002] The harm caused by low-quality chemical fertilizers, especially fake chemical fertilizers, is well known, ranging from direct economic losses to farmers, to affecting agricultural production, causing environmental pollution, and destroying ecology. At present, the domestic quality inspection of chemical fertilizers is mainly undertaken by quality and technical supervision bureaus at all levels, and the detection methods adopted are the national standards formulated in the 1980s (GB / T 3595-83 Titration after distillation; GB / T 3600-83 Formaldehyde method; GB / T 3597-83 Nitrogen Reagent Gravimetric Method), although these methods are accurate, they are ...

Claims

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Application Information

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IPC IPC(8): G01N31/22
Inventor 李慧芝许崇娟庄海燕张瑾解文秀
Owner UNIV OF JINAN