State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, PR China.
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, PR China.
Talanta. 2018 Mar 1;179:312-317. doi: 10.1016/j.talanta.2017.11.043. Epub 2017 Nov 21.
A fast and sensitive analysis for trace level heavy metals in aqueous solution was realized by using an improved laser induced breakdown spectroscopy (LIBS) methodology. Solutions containing heavy metal elements, Ni, Cr, and Cd, were concentrated in a laser-pretreated area (25 × 20mm) of a polished aluminum target surface, wherein pretreated grooves enabled homogeneous distribution of the metallic solutions in the well-defined area, and laser ablation of the aluminum target produced unique plasma excitation of various metallic ions. For 1-mL solutions deposited, we obtained an analytical precision of about 7% relative standard deviation (RSD), and limits of detection (LODs) of 22, 19, and 184μg/L for Ni, Cr, and Cd, respectively. Moreover, the laser-pretreated metallic microstructure allowed more solution deposited with the help of a hot plate, which supported improvement of LODs to sub-μg/L level for Cr and Ni and μg/L level for Cd with about 20-mL solution engaged in the enrichment processes. The applicability of the proposed methodology was validated on certified reference materials and real river water.
采用改进的激光诱导击穿光谱（LIBS）方法，实现了对痕量重金属在水溶液中的快速灵敏分析。将含有重金属元素 Ni、Cr 和 Cd 的溶液集中在经过激光预处理的（25×20mm）抛光铝靶表面区域，其中预处理的凹槽使金属溶液在限定的区域内均匀分布，而激光烧蚀铝靶则产生了各种金属离子的独特等离子体激发。对于沉积的 1mL 溶液，我们获得了约 7%的相对标准偏差（RSD）的分析精度，以及 Ni、Cr 和 Cd 的检测限（LOD）分别为 22、19 和 184μg/L。此外，激光预处理的金属微结构允许在热板的帮助下沉积更多的溶液，这有助于将 Cr 和 Ni 的 LOD 提高到亚μg/L 水平，而 Cd 的 LOD 则提高到μg/L 水平，大约有 20mL 溶液参与了富集过程。所提出的方法的适用性已经在认证参考材料和实际河水上得到了验证。
