Laser-induced breakdown spectroscopy based device for measuring seawater quality and metal element

Abstract

The present invention discloses a laser-induced breakdown spectroscopy based device for measuring seawater quality and metal element. The device includes a laser, a sample compartment, a control circuit, fibers, a spectrometer and a computer. The method is as below: first subjecting a tested sea water sample by an autosampler system for precise titration; then drying the sample by a heating and drying unit; rotating to a measuring position by an automatically rotating tray; and finally conducting spectral measurement on the sample with a graphite matrix by using laser-induced breakdown spectroscopy. The device has the advantages of high detection speed, high sensitivity, simple operation, no complicated process on tested water sample, no chemical reagent and no secondary pollution, and can simultaneously achieve on-line measurement of continuous water quality and multiple metal elements.

Description

technical field [0001] The patent of the present invention relates to the field of seawater pollution detection, in particular to the field of environmental optical detection technology, specifically a laser-induced breakdown spectrum continuous measurement device for seawater quality metal elements. Background technique [0002] In recent years, with the continuous acceleration of China's industrialization process, domestic environmental pollution has become increasingly serious. Among them, the metal pollution of coastal waters has become very prominent. At present, the existing detection methods are mainly based on on-site sampling and laboratory analysis, mainly including spectrophotometry, atomic absorption / emission spectroscopy, inductively coupled plasma emission spectroscopy and ion selective ionization. These methods have expensive instruments and high operating costs. Some sample pretreatment procedures are complicated, there is secondary pollution, and some metho...

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Problems solved by technology

However, there is currently no instrument for continuous on-line detection of metal elements in seawater.

[0004] In addition, when laser-induced breakdown spectroscopy is used for measurement, the electron density in the plasma region on the surface of the sample to be tested is relatively high, which shields the laser energy, making subsequent laser energy unable to reach the surface of the sample to be tested, preventing the The continuous ablation of the test sample; in order to solve this technical problem, there is a method of using dual laser sources, and a method of using a single laser source with dual wavelengths, such as the Chinese patent application No. 201320642799.5 which discloses this structure; However, none of these methods can avoid the problem of splashing and reducing the plasma intensity when the LIBS technology directly acts on the water body. In addition, since the laser beam converges at a point on the graphite substrate, it is easy to produce uneven beam irradiation, which affects the measurement results.

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