Method for analyzing trace Pb element in aqueous solution through combination of electrodeposition and SD-LIBS

Abstract

The invention is applicable to the field of heavy metal pollution analysis, and provides a method for analyzing trace Pb element in an aqueous solution by combining electro-deposition and SD-LIBS (spark discharge assisted laser-induced breakdown spectroscopy), the trace heavy metal Pb element in the aqueous solution is enriched on the surface of a high-purity Al plate under the enrichment voltage of 8V and the enrichment time of 10min by adopting an electro-deposition method, and the trace heavy metal Pb element in the aqueous solution is enriched on the surface of a high-purity Al plate under the enrichment voltage of 8V and the enrichment time of 10min. The problems of low sensitivity and low accuracy when the LIBS is used for directly detecting the water sample are solved; detecting the Pb element on the surface of the Al plate by adopting an SD-LIBS technology so as to enhance the emission intensity of Pb (I); and a calibration curve of Pb (I) at 405.78 nm under different discharge voltages is drawn, the slope (S) of the calibration curve is increased along with the rise of the discharge voltages, and the detection limit (LoD) is reduced. Therefore, high-sensitivity detection of trace heavy metal elements in an aqueous solution can be realized by combining an electrodeposition method and an SD-LIBS technology.

Description

technical field [0001] The invention belongs to the field of heavy metal pollution analysis, and particularly relates to a method for combining electrodeposition and SD-LIBS to analyze trace Pb elements in an aqueous solution. Background technique [0002] Due to the rapid economic development, industry, agriculture and human daily life have all caused serious water pollution. The ever-increasing amount of metal waste in water poses a potential threat to human health and life. Therefore, the development of high-sensitivity water environment monitoring technology is particularly necessary. Currently, commonly used water environment monitoring techniques can be divided into the following types: electrochemical analysis, spectrophotometry, atomic fluorescence spectroscopy, atomic absorption spectroscopy, inductively coupled plasma emission spectroscopy and inductively coupled plasma mass spectrometry. Although the above-mentioned methods have high measurement accuracy, they a...

AI Technical Summary

Problems solved by technology

[0003] When LIBS analyzes trace elements in the liquid matrix, the laser irradiates the liquid, which is prone to liquid sputtering and liquid level fluctuations, and the evaporated liquid will absorb and scatter the laser light, greatly reducing the efficiency of laser ablation liquid

Therefore, direct laser ablation of liquid will result in short plasma lifetime, weak emission intensity, large spectral fluctuations, and affect the sensitivity and accuracy of LIBS detection.

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