Department of Analytical Chemistry and Food Science and University Institute of Materials, University of Alicante, P.O. Box 99-03080, Alicante, Spain.
Department of Analytical Chemistry and Food Science and University Institute of Materials, University of Alicante, P.O. Box 99-03080, Alicante, Spain.
Talanta. 2015 Jan;131:348-53. doi: 10.1016/j.talanta.2014.07.090. Epub 2014 Aug 11.
A rapid and efficient Dispersive Liquid-Liquid Microextraction (DLLME) followed by Laser-Induced Breakdown Spectroscopy detection (LIBS) was evaluated for simultaneous determination of Cr, Cu, Mn, Ni and Zn in water samples. Metals in the samples were extracted with tetrachloromethane as pyrrolidinedithiocarbamate (APDC) complexes, using vortex agitation to achieve dispersion of the extractant solvent. Several DLLME experimental factors affecting extraction efficiency were optimized with a multivariate approach. Under optimum DLLME conditions, DLLME-LIBS method was found to be of about 4.0-5.5 times more sensitive than LIBS, achieving limits of detection of about 3.7-5.6 times lower. To assess accuracy of the proposed DLLME-LIBS procedure, a certified reference material of estuarine water was analyzed.
采用快速高效的分散液液微萃取（DLLME）结合激光诱导击穿光谱检测（LIBS），对水样中 Cr、Cu、Mn、Ni 和 Zn 进行了同时测定。样品中的金属与四氯化碳形成吡咯烷二硫代氨基甲酸盐（APDC）络合物，采用涡旋搅拌实现萃取溶剂的分散。采用多元方法对影响萃取效率的几个 DLLME 实验因素进行了优化。在最佳 DLLME 条件下，DLLME-LIBS 法的灵敏度比 LIBS 法约高 4.0-5.5 倍，检出限约低 3.7-5.6 倍。为了评估所提出的 DLLME-LIBS 程序的准确性，对河口水样的认证参考物质进行了分析。
