基于超疏水基底的水中微量铅元素的LIBS快速测量方法

Rapid measurement of trace lead in water by laser-induced breakdown spectroscopy coupled with super-hydrophobic nano-substrate

铅(Pb)是饮用水中的一种常见微量重金属有害污染物,但目前常规测量方法很难对其进行快速有效的测量。为了定性提高激光诱导击穿光谱(LIBS)技术对饮用水中铅的检测限,在被测基地表面制备了超疏水涂层,利用超疏水效应使待测溶液不断在基底表面汇聚,提出了一种水中微量铅的快速测量方法。与传统的滤纸法相比,该方法对铅的检测能力有了很明显的增强效果,可以明显的检测出10μg/L铅溶液中的铅元素。此外,利用超缩水的聚集效应,对5个不同浓度(100～500μg/L)的铅溶液进行了定量分析,并建立出了较好的回归曲线模型,其决定系数R2达到0. 995 5,它的预测检测限可以达到6. 297μg/L。结果显示了此方法有助于饮用水中重金属铅的测量,具有高灵敏、快速测量、可定量的优势,有望应用于饮用水质的快速鉴定。

Lead( Pb) is a common trace heavy metal and harmful pollutant in drinking water,but it is difficult to be measured quickly and effectively by conventional methods. In order to qualitatively improve the detection limit of lead in drinking water by traditional LIBS technology,we made a super-hydrophobic coating on the surface of the measured substrate,and used the super-hydrophobic effect to make the solution converge on the substrate surface continuously,and proposed a method for rapid measurement of trace lead in water by LIBS based on super-hydrophobic nano-substrate. Compared with the traditional filter paper method,this method can obviously enhance the ability of detection of lead and detect lead in 10 μg/L lead solution. In addition,using the aggregation effect of super-hydrophobic,we quantitatively analyzed the lead solutions with five different concentrations( 100-500 μg/L) and found that it could establish a good regression curve model with a determination coefficient R2 of 0. 995 5 and its predicted detection limit could reach 6. 297 μg/L. This result shows that this method contributes to the measurement of heavy metal lead in drinking water with high sensitivity,rapid measurement and quantitative analysis,and is expected to be applied to the rapid identification of drinking water quality.