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Determination reagent for trace content of heavy metal

A technology of heavy metals and reagents, which is applied in measurement devices, electrochemical variables of materials, material analysis by electromagnetic means, etc., can solve the problems of poor reproducibility and low sensitivity, and achieve the effect of good reproducibility and high sensitivity

Inactive Publication Date: 2005-01-26
北京艾联联合科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problems of low sensitivity and poor reproducibility of the above-mentioned method for detecting trace elements

Method used

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  • Determination reagent for trace content of heavy metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Get blood sample 0.1mL, measure the lead content therein. Add 3mL of special reagent, select formula 1 in Table 1, the reagent contains 1.5% chromium trichloride, 2.5% potassium nitrate, 0.05% mercury dichloride, 0.15% propylene glycol, use nitric acid to adjust the pH value to 1, mix well and dissolve at the anode Measured on a voltammetry electrochemical instrument.

Embodiment 2

[0021] Embodiment 2: Take 0.5 mL of sewage, and measure the copper content therein. Add 5mL of special reagent, select formula 2 in Table 1, the reagent contains 2% chromium trichloride, 1.2% sodium chloride, 0.01% mercury dichloride, 0.5% ethanol, use phosphoric acid to adjust the pH value to 1.5, mix evenly on the anode The stripping voltammetry was carried out on an electrochemical instrument.

Embodiment 3

[0022] Embodiment 3: take milk 0.5mL, measure the zinc content therein. Add 5mL of special reagent, select formula 3 in Table 1, medium reagent contains 1% chromium trichloride, 3% sodium nitrate, 0.01% mercury dichloride, 0.3% ethanol, use nitric acid to adjust the pH value to 1, mix evenly on the anode The stripping voltammetry was carried out on an electrochemical instrument.

[0023] Similarly, according to the other formulations in Table 1, other components and detection methods are the same as the above three examples, and can be applied to detect the content of heavy metal ions in fields including biomedicine, food, and environment.

[0024] Detection serial number

[0025] Because the anode stripping voltammetry method is easy to operate, the measurement reagent of the present invention has good reproducibility and high sensitivity when measuring samples, and can measure PPb orders of magnitude.

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Abstract

It is a reagent for measuring the marked heavy metal component, which substitute the containing heavy metal ion in the sample before using the method of anodic stripping voltammetry for measuring. The reagent comprises one to three percent of soluble chromate salt, one to five percent of potassium salt or sodium salt, 0.01 to 0.2 percent of soluble mercury salt for guarding electrode, and a organic solvent with one to three ph value to increase dispersibility and eliminate foams. The said reagent is combined with electrochemical measuring device and is characterized by quickness, convenience, high accuracy and reproduction ability.

Description

【Technical field】 [0001] The invention relates to a reagent for measuring the content of heavy metal ions. 【Background technique】 [0002] The methods commonly used to determine the content of trace heavy metals are: atomic absorption spectrometry, which is a conventional elemental analysis method, but the determination of trace elements has low sensitivity and complicated operation, and the sample pretreatment also needs to go through more complicated steps such as nitration. Zeeman-effect graphite furnace atomic absorption spectrometry is an accurate and reliable method, but the samples also need pretreatment such as nitration, the operation is complicated, and the cost is high, so it is difficult to apply on a large scale. In addition, there is a method of colorimetric determination using a complexing agent and a heavy metal ion to form a colored complex, which has low sensitivity and poor reproducibility, and is rarely used now. Anodic stripping voltammetry is an electr...

Claims

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Application Information

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IPC IPC(8): G01N27/411G01N27/49
Inventor 郭雁
Owner 北京艾联联合科技发展有限公司
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