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Method for detecting tiny amount of lead in air

A detection method, air technology, which is applied in the field of environmental sample detection, can solve the problems that cannot meet the requirements of trace lead determination, etc., and achieve the effect of low cost, good recovery rate and precision, and fast speed

Inactive Publication Date: 2015-02-25
SHAANXI HUALU CHEM ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The determination of lead in the current national environmental standard monitoring methods includes dithizone spectrophotometry and flame atomic absorption spectrophotometry, and the detection concentration can reach a minimum of 10 μg / L. Determination requirements for trace lead in ambient air

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) Take a blank filter paper, put it into a small beaker, add 10mL 3% nitric acid, boil slowly for 15-20 minutes, stir, transfer the solution into a 25mL colorimetric tube, wash the beaker and filter paper with a small amount of hot 3% nitric acid for 2-3 The second time, the washing solution was incorporated into the colorimetric tube, and the volume was adjusted to the scale with 3% nitric acid, then transferred to a 50mL beaker, and then 25.0mL of 0.5mol / L sodium acetate was added, and inserted into the three electrodes of the potential dissolution apparatus (when measuring, the upper limit Potential -0.90V, lower limit potential -0.20V, electrolysis potential -1.10V, stirring time 60 seconds, resting time 30 seconds, sensitivity S=10-30), measure blank peak height; then add 10.0μg / mL successively with a micro syringe Lead standard solution 10.0μL, 20.0μL, 50.0μL, 100.0μL, 200.0μL, 300.0μL, 400.0μL, 500.0μL, respectively record the peak height, this standard solution...

Embodiment 2

[0014] Embodiment two: the mensuration of actual air sample

[0015] Carry out air sampling on-site of a certain printing factory, detect according to the detection method described in the present invention, and the detection result is as shown in Table-1.

[0016] Table-l test results

[0017] .

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Abstract

The invention discloses a method for detecting a tiny amount of lead in air and belongs to the field of environment sample detection methods. The method comprises the following steps of 1, adding nitric acid into a blank filter paper, carrying out boiling and stirring, transferring the solution into a colorimetric pipe, adding a washing lotion into the colorimetric pipe, adding nitric acid into the colorimetric pipe to obtain a desired volume of the solution, transferring the solution into a beaker with a volume of 50mL, adding sodium acetate into the beaker, inserting three electrodes of a potentiometric dissolution tester into the beaker, detecting blank peak heights, adding different lead standard solutions into the beaker, respectively recording peak heights and drawing a standard curve of the peak heights and lead contents, and 2, taking an air sample, then removing the filter paper, adding nitric acid into the sample, carrying out boiling and stirring, transferring the solution into a colorimetric pipe, adding a washing lotion into the colorimetric pipe, adding a nitric acid solution into the colorimetric pipe to obtain a desired volume of the solution, transferring the solution into a beaker with a volume of 50mL, adding sodium acetate into the beaker, inserting the three electrodes into the beaker, detecting peak heights and calculating lead concentration of air. The method has the advantages of high sensitivity, good recovery rate, good precision, fast rate and low cost, can be used as a method for detecting a tiny amount of lead in air by an environment monitoring station and can be popularized and used.

Description

technical field [0001] The invention relates to a method for detecting trace amounts of lead in the air, belonging to the field of detection methods for environmental samples. Background technique [0002] Lead is an accumulative poison, easily absorbed by the stomach, and affects the metabolism of enzymes and cells through the blood. Excess lead intake will seriously affect people's health, the main toxicity is to cause anemia, nervous dysfunction and kidney damage. Most of the lead in the natural air comes from the dust pollution of mining, metallurgy, and chemical industry. Due to the toxicity of lead, it is an important indicator for environmental monitoring and control. The determination of lead in the current national environmental standard monitoring methods includes dithizone spectrophotometry and flame atomic absorption spectrophotometry, and the detection concentration can reach a minimum of 10 μg / L. Requirements for the determination of trace amounts of lead in ...

Claims

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Application Information

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IPC IPC(8): G01N27/26
Inventor 陆强
Owner SHAANXI HUALU CHEM ENVIRONMENTAL PROTECTION
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