Laser-induced breakdown spectroscopy (LIBS) has been evaluated for measurement of As, Hg, S, and Se in aqueous samples. Single pulse (SP) and double pulse (DP) LIBS, with a 1064 nm Nd: YAG laser source, were utilized to generate micro plasma from the surface of a liquid jet containing these elements. Plasma emission was collected at a 45° angle with the laser beam for As and Se detection in UV wavelength range. However, the confocal mode was used to collect the atomic emission for Hg and S detection in visible and near IR range, respectively. Atomic emission lines 228.81 nm for As, 546.07 nm for Hg, 921.2 nm for S, and 196.09, 203.98 and 206.32 nm for Se were detected in the LIBS spectra. Calibration curves were developed to estimate the limit of detection for each analyte and found to be 2, 16, 16, and 29 ppm for As, Hg, S, and Se, respectively, with SP LIBS and 0.4, 8, 8 and 11 ppm, respectively, with DP LIBS. The study has implications in monitoring of these pollutants in flue gas desulfurization (FGD) wastewater.

中文翻译：

---

基于激光的光学诊断技术测定液体射流中的 As、Hg、S 和 Se

激光诱导击穿光谱 (LIBS) 已被评估用于测量水性样品中的 As、Hg、S 和 Se。单脉冲 (SP) 和双脉冲 (DP) LIBS 以及 1064 nm Nd:YAG 激光源被用于从包含这些元素的液体射流表面产生微等离子体。与激光束成 45° 角收集等离子体发射，用于紫外波长范围内的 As 和 Se 检测。然而，共聚焦模式分别用于收集可见光和近红外范围内汞和硫检测的原子发射。在 LIBS 光谱中检测到 As 的原子发射线为 228.81 nm，Hg 为 546.07 nm，S 为 921.2 nm，Se 为 196.09、203.98 和 206.32 nm。开发校准曲线以估计每种分析物的检测限，发现 As、Hg、S 和 Se 分别为 2、16、16 和 29 ppm，SP LIBS 和 DP LIBS 分别为 0.4、8、8 和 11 ppm。该研究对监测烟气脱硫 (FGD) 废水中的这些污染物具有重要意义。