Method for promoting sensitivity of metal pollutants in water in laser breakdown spectrum detection
A technology of laser breakdown spectroscopy and pollutants, applied in the field of laser spectroscopy analysis, can solve problems such as low sensitivity, and achieve the effects of extending emission life, improving spectral stability, and improving sensitivity and detection limit
Active Publication Date: 2012-12-05
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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[0004] The purpose of the present invention is to provide a method for improving the detection sensitivity of metal pollutants in water bodies by laser breakdown spectroscopy, so as to solve the problem of low sensitivity in the direct measurement of liquid samples by laser-induced breakdown spectroscopy in the prior art
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[0028] In view of the requirement of rapid and multi-element simultaneous detection of heavy metal elements in water, graphite was selected as a solid carrier, and heavy metal elements in water such as Cr, Cd, Pb, Zn, Ni were measured and analyzed in the laboratory. The results show that: ①, the influence of water droplet sputtering directly acting on the water surface is eliminated; ②, the emission spectrum of C element in graphite is used for internal normalization, which reduces the influence of system parameters, environmental conditions and sample characteristics on the measurement results. ③, the emission life of laser plasma is extended from 700ns directly acting on the water surface to 2100ns; ④, the spectral line intensity has increased by nearly 10 times; ⑤, the detection limit of each element Also increased by 2-5 times.
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The invention discloses a method for promoting sensitivity of metal pollutants in water in laser breakdown spectrum detection. According to the method, a thin to-be-measured liquid film is formed on the surface of a solid carrier by a to-be-measured liquid sample in an atomized form, so as to convert the measurement for the to-be-measured liquid sample into the analysis for the solid carrier, thereby realizing the measurement for metal elements in the water. According to the method provided by the invention, the complex sample preparation is unnecessary, the stability of laser plasma measurement is promoted, the influence of water drop sputtering is eliminated, the emission life of a laser plasma is prolonged, the emission power of a laser plasma spectral line is promoted, the limit of detection of the analyzed elements is greatly promoted, and the influence of residues of the analyzed liquid sample is avoided. The method provided by the invention is suitable for various analyses of the elements in the liquid sample, in which a laser induced breakdown spectrum process is taken as an analysis means.
Description
technical field [0001] The invention relates to the field of laser spectrum analysis, in particular to a method for improving the detection sensitivity of laser breakdown spectrum water body metal pollutants. Background technique [0002] Laser-induced breakdown spectroscopy technology uses short-pulse laser focusing to generate high-temperature plasma on the surface of the sample. Before the plasma cools, the excited atoms, ions, and molecules will generate plasma emission lines characteristic of elemental composition. Plasma spectroscopy and analysis of specific element line intensities for quantitative measurement of element content. The system composition and principle of laser-induced breakdown spectroscopy measurement are as follows: figure 1 shown. The system consists of laser emitting components, optical receiving components and detection components. The laser light emitted by the laser is focused by the mirror and the focusing lens to generate laser plasma on the...
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IPC IPC(8): G01N21/63G01N21/15
Inventor 赵南京刘文清张玉钧刘建国石焕王春龙马明俊刘立拓陈东
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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