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首页> 外文会议>OCEANS 2011 >Spectroscopy and imaging of laser-induced plasmas for chemical analysis of bulk aqueous solutions at high pressures
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Spectroscopy and imaging of laser-induced plasmas for chemical analysis of bulk aqueous solutions at high pressures

机译：激光诱导等离子体的光谱学和成像，用于高压下大体积水溶液的化学分析

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Laser-induced breakdown spectroscopy (LIBS) is a chemical sensing technique that has been demonstrated in numerous applications on land. This study investigates the application of LIBS as a technique for in situ analysis of the chemical composition of the ocean. The effects of pressure on the spectral emissions of various different elements in bulk aqueous solution has been evaluated, and imaging of plasmas generated in liquids at pressures between 0.1–30 MPa has been performed. The observations indicate that during the early stages of laser-induced breakdown, in the time frame when spectroscopic measurements are made, the plasma and surrounding phenomena (formation of shockwaves and cavitation bubbles) are almost independent of the surrounding hydrostatic pressure up to 30 MPa. Spectroscopic investigations found that Na, Ca, and Mg are detectable in liquid at pressures from 0.1 to 30 MPa, at concentrations of 1, 10, and 500ppm, respectively. These elements are of key importance in the identification of hydrothermal vent fluids. The results of this study suggest that laser induced spectroscopy is applicable for in situ elemental analysis of liquids at oceanic pressures.
机译：激光诱导击穿光谱法（LIBS）是一种化学传感技术，已在陆地上的许多应用中得到证明。这项研究调查了LIBS作为海洋化学成分的原位分析技术的应用。已经评估了压力对散装水溶液中各种不同元素的光谱发射的影响，并且对液体中在0.1-30 MPa之间的压力下产生的等离子体进行了成像。这些观察结果表明，在激光引起的击穿的早期阶段，在进行光谱测量的时间范围内，等离子体和周围的现象（冲击波和空化气泡的形成）几乎与周围的静水压力（最高30 MPa）无关。光谱研究发现，在液体中，Na，Ca和Mg分别在0.1至30 MPa的压力下，浓度分别为1、10和500ppm时可检测到。这些元素在识别热液排放流体中至关重要。这项研究的结果表明，激光诱导光谱法可用于大气压下液体的原位元素分析。

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