Laser breakdown spectrographic detection method and system for metal pollutants in water body

Abstract

The invention discloses a laser breakdown spectrum detection method and system for metal pollutants in a water body. Short-pulse lasers are used to focus and act on the surface of a water sample to generate high-temperature plasma. Before the plasma is cooled, the excited atoms, ions and molecules will produce elements. Plasma emission lines of composition characteristics, by receiving the plasma spectrum of water samples and analyzing the intensity of specific element lines for quantitative measurement of element content. The laser light emitted by the laser is coupled to the emission fiber through the laser coupling lens group, and the laser emission and laser plasma signal reception are carried out by the laser coupling lens group. Signal conversion, and then enter the data acquisition and processing system for data acquisition and processing. The invention realizes multi-element real-time and in-situ detection of metal elements in water bodies, is suitable for multi-element quantitative analysis of toxic heavy metal elements in industrial wastewater under harsh environmental conditions, and can be used for multi-element real-time detection of heavy metals and toxic metal pollutants in environmental water bodies in my country , On-line measurement, fixed-point monitoring, and on-site emergency monitoring.

Description

technical field [0001] The invention belongs to environmental water body pollution monitoring technology, in particular to a laser spectrum detection method and system for water body metal pollutants. Background technique [0002] Heavy metals and toxic metal pollutants in water are typical pollutants that are easy to accumulate in sediments. They can be enriched in organisms, affecting the ecological environment and affecting human health through the food chain. At present, the metal pollutants in my country's environmental water bodies are still based on on-site sampling and laboratory analysis, and there are limited items for one-time analysis of elements. Automatic and continuous monitoring of polluted water bodies; in harsh environments, real-time monitoring of metal element content is even more difficult or even impossible due to the impossibility of on-site sampling. [0003] In the monitoring of water body metal pollutants (including cadmium, chromium, lead, mercury,...

AI Technical Summary

Problems solved by technology

At present, the metal pollutants in my country's environmental water bodies are still based on on-site sampling and laboratory analysis, and there are limited items for one-time analysis of elements. Automatic and continuous monitoring of polluted water bodies; in harsh environments, real-time monitoring of metal element content is even more difficult or even impossible due to the impossibility of on-site sampling

[0003] In the monitoring of water body metal pollutants (including cadmium, chromium, lead, mercury, silver, gold, copper, zinc, iron, etc.), the content of heavy metal elements in water is mostly determined by atomic absorption method and atomic absorption photometry. The analysis procedure is complicated and time-consuming; the collection, storage, transportation and determination of samples have strict requirements, and errors in any link can cause deviations in measurement results and easily cause secondary pollution of samples, which is necessary Environmental water quality monitoring and management bring false information

In terms of the monitoring of organometallic compounds (such as organic mercury, organic cadmium, etc.), there is still no effective monitoring method at present. Therefore, it is imperative to develop fast and real-time monitoring technology and systems

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