Method and device for detecting trace metal elements in water body by using laser-induced breakdown spectroscopy assisted by direct current discharging vaporization

Abstract

The invention discloses a method and a device for detecting trace metal elements in a water body by using the laser-induced breakdown spectroscopy assisted by direct current discharging vaporization. High voltage direct current discharging is utilized to vaporize a liquid sample, the vaporized sample is separated through a separation device, gas is injected to a graphite bearing piece, the graphite bearing piece containing elements to be detected is subjected to pulse laser ablation induction to generate plasma and transmit spectroscopy signals, and finally a spectrograph is utilized to conduct detection analysis to measure the trace metal in the water body. By means of the method and the device, the pulse laser sample ablation efficiency is greatly improved, the detected spectroscopy signals are greatly strengthened, the detection sensitivity is improved, the detection limit of the metal elements is reduced, and the method is feasible for online high-efficiency quick detection of the metal elements in the water body.

Description

Technical field: [0001] The invention relates to the field of laser diagnosis and spectral measurement and analysis, especially a device and method for rapid detection of heavy metals in water bodies. Efficient detection. Background technique: [0002] At present, water pollution has become a global problem, and seriously affects the health and life safety of children and adults. If the human body takes too much molybdenum, it will cause gout-like syndrome, joint pain and deformity, kidney damage, and growth and development. Slow, arteriosclerosis, connective tissue degeneration and other diseases. Heavy metal mercury is an accumulative poison. In addition to chronic and acute poisoning, it also has carcinogenic and mutagenic effects. Minamata disease in Japan is caused by the accumulation of methylmercury in the brains of humans and animals. After cadmium enters the human body, it forms cadmium protein in the body, reaches the whole body through blood circulation, and sel...

AI Technical Summary

Problems solved by technology

However, the current detection limit of metal elements in water using laser-induced breakdown spectroscopy is still high, which cannot meet the detection requirements in some fields.

When using laser-induced breakdown spectroscopy to detect liquid samples, the current common method is to use liquid jets for detection. It is found in experiments that the excitation threshold of liquid excitation to generate plasma is usually relatively large, and the stability of the signal detected in the experiment Its biggest shortcoming is the high detection limit of heavy metal elements, which restricts the practical application of laser-induced breakdown spectroscopy in the detection of liquid samples.

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