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Method for detecting content of heavy metals

A heavy metal content technology, applied in the measurement device, material analysis, instrument and other directions by observing the influence on the chemical indicator, to achieve the effect of simple and fast operation, cost saving and convenient operation

Inactive Publication Date: 2018-03-06
HEZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, colorimetric detection methods for individual metals have been reported one after another, and some detection instruments have appeared on the market, but none of the detection methods can accurately detect heavy metals in the environment qualitatively and quantitatively.

Method used

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  • Method for detecting content of heavy metals

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Effect test

Embodiment 1

[0019] The present invention is a method for detecting heavy metal content, said method comprising the following steps: (1) preparation of test solution: preparing an aqueous solution of heavy metal sample to be tested, adding aqua regia and potassium iodide solution to obtain test solution; (2) Test liquid detection: pipette the liquid to be tested, drop it on the test paper to develop color for 50 seconds, and the test paper contains diaryl alkyl basic cationic dyes; Perform a visual comparison to determine the lead concentration.

[0020] According to the method of the present invention, the citric acid solution and the ascorbic acid solution of dimercaptopropanol are also added when the liquid to be tested is prepared, wherein, 0.5 parts of acid solution and 0.5 parts of dimercaptopropanol are added in 4 parts of sample solutions to be tested. Acid solution, 0.4 parts of ascorbic acid solution and 1.0 part of potassium iodide solution were added to constant volume with wat...

Embodiment 2

[0024] The present invention is a method for detecting heavy metal content, said method comprising the following steps: (1) preparation of test solution: the test heavy metal sample is prepared into an aqueous solution, adding 2.5mol / L nitric acid solution and potassium iodide solution, to obtain test solution (2) detection of the liquid to be tested: pipette the liquid to be tested and add it dropwise to the test paper to develop color for 80 seconds, which contains acid dye; According to the comparison, determine the lead concentration.

[0025] According to the method of the present invention, citric acid solution and ascorbic acid solution of sodium dimercaptopropanesulfonate are also added when the test solution is prepared, wherein, 0.7 parts of acid solution, 1.5 parts of lemon thioglycolic acid are added in 5 parts of sample solutions to be tested. acid solution, 0.6 parts of ascorbic acid solution and 2.0 parts of potassium iodide solution, add water to constant volum...

Embodiment 3

[0029] The present invention is a method for detecting heavy metal content, said method comprising the following steps: (1) preparation of the test solution: preparing the test heavy metal sample into an aqueous solution, adding 4mol / L hydrochloric acid solution and potassium iodide solution, to obtain the test solution; 2) Detection of the liquid to be tested: pipette the liquid to be tested and add it dropwise to the test paper to develop color for 100 seconds. The test paper contains acidic mordant dyes; According to the comparison, determine the lead concentration.

[0030] Optionally, according to the method of the present invention, citric acid solution and ascorbic acid solution of sodium dimercaptopropanesulfonate are also added when the test solution is prepared, wherein, 0.9 parts of acid solution, 2.5 parts of A citric acid solution of sodium dimercaptopropanesulfonate, 0.9 parts of ascorbic acid solution and 3.0 parts of potassium iodide solution were added to cons...

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Abstract

The invention provides a method for detecting a content of heavy metals, which belongs to the technical field of the detection of metal ions. The method comprises the following steps: (1) preparing asolution to be detected: preparing a heavy metal sample to be detected into an aqueous solution, adding an acidic solution and a potassium iodide solution, and obtaining the solution to be detected; (2) detecting the solution to be detected: moving the solution to be detected, dropwise adding the solution to be detected onto test paper, developing the color for 50s to 100s, wherein the test papercontains dye; and (3) judging a detection result: visually comparing the color developing test paper and a colourimetric card, and determining a concentration of the heavy metal. By adopting the method for detecting the heavy metals, a rapid detection effect can be achieved, the detection efficiency is increased, and the field operation is also facilitated.

Description

【Technical field】 [0001] The invention belongs to the technical field of metal ion detection, and in particular relates to a method for detecting heavy metal content. 【Background technique】 [0002] Metals with a relative density above 4.5g / cm3 in the physical sense are called heavy metals. There are 60 natural metal elements with atomic numbers ranging from 23 (V) to 92 (U), of which 54 have a relative density greater than 4.5 g / cm3, so in terms of relative density, these 54 metals are all heavy metals. However, when conducting elemental analysis, some of them belong to rare earth metals, and some are classified as refractory metals. Finally, the elements that are actually classified as heavy metals in industry are: copper, lead, zinc, tin, nickel, cobalt, antimony, Mercury, cadmium, and bismuth, these 10 metals are widely used in modern industry. Except for the commonality of metals and the density greater than 5, there is no other special commonality in physics. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/77
CPCG01N21/78G01N21/77G01N2021/7759
Inventor 谢微罗杨合段振华苏辉兰
Owner HEZHOU UNIV
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