Laser-induced breakdown spectrometry continuous detection device and method for heavy metal of water body

Abstract

The invention discloses a laser-induced breakdown spectrometry continuous detection device and method for heavy metal of a water body, and is based on the laser-induced breakdown spectrometry technology, graphite substrates are taken as water sample carriers, and continuous, on-line and automatic detection of content of heavy metal of the water body can be realized effectively in a laboratory through automatic loading and unloading of graphite substrates on an automatic control rotating platform, automatic sample introduction and accurate titration of a water sample, drying of the sample, and spectral measurement and analysis. The method is simple and convenient to operate, all that is needed is to add graphite substrates periodically, the detection speed is high, the sensitivity is high, the whole working process is carried out in a full-automatic manner, no chemical reagent is used, no secondary pollution is caused, the operation and maintenance costs are low, and the purpose of continuous, on-line and automatic detection of multiple elements of heavy metal of the water body can be achieved at the same time. The device and the method fill the blank in the technical field of continuous, on-line and automatic detection of heavy metal of a water body in the country, can satisfy the use requirements for continuous and on-line measurement of water body environment in the country, and have a very broad application prospect.

Description

technical field [0001] The invention relates to the field of environmental water pollution monitoring, in particular to a laser-induced breakdown spectrum continuous detection device for heavy metals in water. Background technique [0002] Due to the discharge of industrial pollution, the air, water, and soil are seriously polluted by heavy metals, and pollution incidents occur frequently, seriously endangering people's health, survival and development. [0003] The existing detection methods are still based on on-site sampling and laboratory analysis, mainly including atomic absorption / emission spectroscopy, inductively coupled plasma mass spectrometry, ion selective electrodes and voltammetry. In contrast, laser-induced breakdown spectroscopy technology provides a new method for rapid and multi-element simultaneous detection of heavy metal elements, which is mainly based on the interaction between laser and matter to generate laser plasma spectra. It has the advantages of...

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Problems solved by technology

[0004] 1. Laboratory analysis equipment such as atomic absorption / emission spectrometers and inductively coupled plasma mass spectrometers require responsible sample pretreatment and are not suitable for on-line continuous detection

[0005] 2. Electrochemical detection methods such as ion-selective electrodes and voltammetry can be used for online continuous detection, but chemical reagents need to be added (for different heavy metal elements to be tested, different reagents are added, different measuring electrodes are used), which is easy to cause secondary pollution , and the electrode needs to be replaced regularly, and the phenomenon of electrode "poisoning" often occurs for different water qualities. Since the electrode is the main component, it is expensive to replace and maintain the electrode for long-term continuous online use

[0006] 3. Laser-induced breakdown spectroscopy technology can realize rapid, online and multi-element simultaneous measurement of heavy metal elements without adding chemical reagents and complicated sample pretreatment, and is suitable for continuous online automatic detection of heavy metals in water, but there is no such technology at present. Continuous Testing Instrument

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