Method for measuring trace lead in water by using sulfydryl paper enrichment and separation colorimetric method

A technology of thiol paper and colorimetry, applied in the field of environmental detection, to achieve high enrichment ratio, easy observation, and good selectivity

Active Publication Date: 2018-12-21
TIANJIN GUANGFU TECH DEV
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Problems solved by technology

[0007] None of the above-mentioned patents discloses detailed descriptions of the relevant materials for the determination of trace lead in water. This patent develops a mercapto-based paper enrichment device, which can enrich water at a high rate, and can be directly measured without rinsing, with high sensitivity. High, simple method, fully meet the determination of trace lead in domestic water and irrigation water

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  • Method for measuring trace lead in water by using sulfydryl paper enrichment and separation colorimetric method
  • Method for measuring trace lead in water by using sulfydryl paper enrichment and separation colorimetric method

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[0048] The content of the invention of the present application will be further described in detail below in conjunction with specific examples. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0049] A method for the determination of trace lead in water by mercapto paper enrichment separation colorimetry, the steps are as follows:

[0050] 1. Preparation of mercapto paper

[0051] (1) Mercapto grafting solution

[0052] Add 60.0ml of thioglycolic acid, 36.0ml of acetic anhydride, 24.0ml of glacial acetic acid, 10 drops of concentrated sulfuric acid, shake well, seal and store away from light;

[0053] (2) Mercapto grafting

[0054] ① Submerge the medium-speed qualitative filter paper strip into the above-mentioned mercapto-grafting solution and soak for 24 hours.

[0055] ②Take out the filter paper strip, shake and wash it in distilled water for 10 minutes, then shake it and wash it in another clea...

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Abstract

The invention relates to a method for measuring trace lead in water by using a sulfydryl paper enrichment and separation colorimetric method; the method comprises the following steps of preparing sulfydryl paper (1), preparing a sulfydryl grafting liquid and 60.0 ml of mercaptoacetic acid, adding 36.0ml of acetic anhydride, 24.0 ml of glacial acetic acid and 10 drops of concentrated sulfuric acid,uniformly shaking and sealing for preservation in a dark place; and performing developing on a sulfydryl paper analysis solution enriched with lead in water, and carrying out detection. The method provided by the invention has the advantages of high enrichment rate and no leaching operation in determination, the problem that the sample is diluted due to leaching operation in a sulfydryl cotton enrichment method is overcome, and the sensitivity of the test is improved.

Description

technical field [0001] The invention belongs to the field of environmental detection, in particular to a method for determining trace lead in water by mercapto paper enrichment separation colorimetry. Background technique [0002] At present, methods for determining trace amounts of lead in environmental water include dithizone colorimetry, atomic absorption spectrometry, polarography, atomic fluorescence, etc. Some of these methods require expensive instruments, and some analysis steps are more complicated. More importantly, Some methods require toxic solvent extraction, and highly toxic potassium cyanide is used as a masking agent. In recent years, it has been reported that the method of measuring lead with sodium rhodine instead of dithizone has been reported. The reaction between lead and sodium rhodinate produces a stable purple-red complex. The mass concentration of lead in the range of 8mg / L-20mg / L conforms to Beer's law , the maximum absorption wavelength is at 546n...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N1/40G01N33/18
CPCG01N1/40G01N21/78G01N33/1813
Inventor 张巍张勇贾伟青
Owner TIANJIN GUANGFU TECH DEV
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