A method to improve the detection sensitivity of metal pollutants in water body by laser breakdown spectroscopy
A technology of laser breakdown spectrum and pollutants, which is applied in the field of laser spectrum analysis, can solve the problems of low sensitivity, achieve the effects of prolonging emission life, improving spectral stability, improving sensitivity and detection limit
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[0028] In response to the need for rapid and simultaneous multi-element detection of heavy metal elements in water, graphite was selected as a solid carrier, and the water heavy metal elements Cr, Cd, Pb, Zn, Ni and other elements were measured and analyzed in the laboratory. The results show that: ①, the influence of water droplets sputtering directly 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 The influence of, improves the stability of the spectrum measurement; ③, prolongs the laser plasma emission life, from 700ns directly acting on the water surface to 2100ns; ④, the intensity of the spectral line is increased by nearly 10 times; ⑤, the detection limit of each element Also increased by 2-5 times.
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