原位液滴微萃取测定水样中的铜

In-situ determination of copper based on single-drop microextraction

以发光二极管（Light—emitting Diode，LED）为光源，便携式电荷藕合器件（Charge Coupled Device，CCD）为检测器，液滴微萃取装置为光学池，自组装的在线分光光度系统用于水样中铜（II）的原位富集和在线测定。在优化的实验条件下，线性范围为2μg·L^-1-50μg·L^-1，相关系数为0．998，检出限为0．2μg·L^-1，富集倍数达49倍。该方法具有灵敏度高，检出限低，简便、快速，有机试剂消耗少，LED光源价廉，系统易于实现自动化以及原位富集和在线测定等优点。本文构建的方法用于矿泉水、河水和自来水的测定，结果满意。

A novel spectmphotometric method based on single-drop microextraction device as an optical cell, was developed for insitu enrichment and on-line determination of copper in water samples. A simple and cheap light-emitting Diode（LED） was employed as the radiation source. Charge coupled device （CCD） served as the detector. Under optimum condition, the system shows linear range of 2μg·L^-1 - 50μg·L^-1, with a correlation coefficient of 0. 998 and has a limit of detection （3σ） of 0. 2μg·L^-1. The enrichment factor was 49. The propesed method has the merits of sensitivity, lower LOD, simplicity, rapidity, and consumption of micro-amounts of organic reagent as well as in-situ enrichment, on-line detection, easy atomization and miniaturization. The technique proposed was applied to determine total copper in mineral water sample, spiked river and tap water samples with satisfactory results.