Selenium detection and removal from industrial and mining effluents have gained attention recently due to the negative effects of this trace element on aquatic life. However, the current methods for the detection of selenium in effluents are off-line by nature. In order to fill this gap, we investigated the use of laser ablation-assisted laser-induced fluorescence (LA-LIF) to measure trace amount of selenium in aqueous solutions. LA-LIF measurements are real time, label-free, standoff, and require no consumables as well as no sample preparation. They can provide a field-amenable, versatile tool for the measurement of selenium in the whole water treatment chain. We describe the system utilized, the temporal and fluence optimization studies, and the resulting calibration curve, which is linear over a wide dynamic range from parts-per-billion to tens of parts-per-million concentration levels. We also show that the achieved limit of detection of selenium can reach 32 µg/L using LA-LIF, without any kind of preconcentration or matrix transfer.

由于这种微量元素对水生生物的负面影响，最近从工业和采矿废水中检测和去除硒受到关注。然而，目前用于检测流出物中硒的方法本质上是离线的。为了填补这一空白，我们研究了使用激光烧蚀辅助激光诱导荧光 (LA-LIF) 来测量水溶液中痕量硒的方法。LA-LIF 测量是实时的、无标签的、隔离的，并且不需要消耗品和样品制备。它们可为整个水处理链中的硒测量提供适用于现场的多功能工具。我们描述了所使用的系统、时间和通量优化研究，以及由此产生的校准曲线，它在从十亿分之几到百万分之几十的浓度水平的宽动态范围内呈线性。我们还表明，使用 LA-LIF 所达到的硒检测限可达到 32 µg/L，无需任何预浓缩或基质转移。