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Heavy metal detection test paper and preparation method and application thereof

A technology for detecting test paper and heavy metals. It is applied in the direction of analyzing materials through chemical reactions and observing the influence of chemical indicators. It can solve the problems of inability to measure the total content of heavy metals and high prices, and achieve detection speed. Fast, easy to make, inexpensive effects

Inactive Publication Date: 2010-11-24
BEIJING OKEANOS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two test papers can selectively detect the content of a certain heavy metal ion, they are expensive and cannot determine whether the total content of heavy metals exceeds the standard.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Preparation of developer solution: add 0.8mol EDTA to the saturated aqueous solution containing 1mol chlorine dioxide, feed high-purity nitrogen until the yellow-green disappears, then cool to room temperature after being incubated at 50°C for 10min; then add 0.8mol Potassium iodide / starch, stir evenly to make color developer solution;

[0036] 2) Soak the filter paper: put the filter paper into the above-mentioned developer solution and soak for 3 hours at room temperature, so that the top and bottom of the filter paper are fully soaked;

[0037] 3) Drying: Take out the soaked filter paper and let it dry naturally;

[0038] 4) Finished product and preservation: the above-mentioned dried filter paper is the finished test paper for rapid detection of the total content of heavy metals. The finished test paper is cut into strips, bound and packaged, and stored in a cool and dry place.

Embodiment 2

[0040] 1) Preparation of developer solution: add 0.8mol EGTA to the saturated aqueous solution containing 0.8mol chlorine dioxide, feed high-purity nitrogen until the yellow-green disappears, then cool to room temperature after being incubated at 50°C for 10min; then add 4mol Chlorophenol red, stir evenly to make a developer solution;

[0041] Steps 2) to 4) are the same as in Example 1.

Embodiment 3

[0043]1) Preparation of developer solution: add 0.8mol PVP to the saturated aqueous solution containing 1.6mol chlorine dioxide, feed high-purity nitrogen until the yellow-green disappears, then cool to room temperature after being incubated at 50°C for 10min; then add 1.6 mol methylene blue, stir to make a developer solution;

[0044] Steps 2) to 4) are the same as in Example 1.

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Abstract

The invention provides heavy metal detection test paper, which is filter paper impregnated with color development reagent solution. The color development reagent solution comprises chlorine dioxide, a heavy metal chelating agent and a chlorine dioxide color development reagent in a molar ratio of 1-5:1:1-10. The invention also provides a preparation method and application of the test paper. The heavy metal detection test paper has the advantages of (1) simple production, low cost and low price; (2) high sensitivity and lowest detection line of 0.004mg / L; (3) simple and convenient use, high detection speed and wide application to rapid detection of total heavy metal content of food, a Chinese herbal extract, water or other fields; and (4) low interference and no influence of the pH value of a sample.

Description

technical field [0001] The invention relates to the detection technology of heavy metals, in particular to a heavy metal detection test paper based on chlorine dioxide and a preparation method and application thereof. Background technique [0002] Heavy metal pollution has become a problem that cannot be ignored in my country. With the rapid development of my country's industry, especially the rapid development of township enterprises, a large amount of industrial wastewater containing heavy metals and its wastes are directly discharged into water bodies without treatment, causing pollution of rivers, rivers, lakes, seas, groundwater and other water sources. Its direct impact is: the edible safety quality of aquatic products is threatened. At the same time, due to the existence of large sewage irrigation areas in many areas of my country, heavy metals accumulate in the farmland of some sewage irrigation areas for a long time, and cases of heavy metal pollution in farmland ar...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 刘迎春高源
Owner BEIJING OKEANOS TECH
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