基于中空纤维的液相微萃取，使用离子液体溶剂，从环境和生物样品中预浓缩铅和镍，然后用电感耦合等离子体原子吸收光谱法测定。

Hollow fiber based-liquid phase microextraction using ionic liquid solvent for preconcentration of lead and nickel from environmental and biological samples prior to determination by electrothermal atomic absorption spectrometry.

机构信息

Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.

出版信息

J Hazard Mater. 2010 Apr 15;176(1-3):481-6. doi: 10.1016/j.jhazmat.2009.11.054. Epub 2009 Nov 13.

DOI:10.1016/j.jhazmat.2009.11.054

PMID:19962233

Abstract

A simple and effective hollow fiber based-liquid phase microextraction (HF-LPME) technique by using ionic liquid, 1-hexyl-3-methylimidazolium hexafluorophosphate, [C(6)MIM][PF(6)], coupled with electrothermal atomic absorption spectrometry (ETAAS) was developed for the determination of lead and nickel in environmental and biological samples. Ammonium pyrroldinedithiocarbamate (APDC) was used as chelating agent. Several factors that influence the microextraction efficiency and ETAAS signal, such as pH, APDC concentration extraction time, amounts of ionic liquid, stirring rate, pyrolysis and atomization temperature were investigated and the microextraction conditions were established. In the optimum experimental conditions, the detection limits (3 s) of the method were 0.03 and 0.02 microg L(-1), for Ni and Pb, respectively and corresponding relative standard deviations (0.5 microg L(-1), n=6) were 4.2% and 5%. The developed method was validated by the analysis of certified reference materials and applied to the determination of lead and nickel in real samples.

摘要

一种简单有效的基于中空纤维的液相微萃取（HF-LPME）技术，使用离子液体 1-己基-3-甲基咪唑六氟磷酸盐 [C（6）MIM][PF（6）]，与电热原子吸收光谱法（ETAAS）结合，用于测定环境和生物样品中的铅和镍。使用氨基吡咯烷二硫代氨基甲酸盐（APDC）作为螯合剂。研究了影响微萃取效率和 ETAAS 信号的几个因素，如 pH 值、APDC 浓度、萃取时间、离子液体用量、搅拌速度、热解和原子化温度，并确定了微萃取条件。在最佳实验条件下，该方法对 Ni 和 Pb 的检测限（3 s）分别为 0.03 和 0.02 μg L（-1），相应的相对标准偏差（0.5 μg L（-1），n=6）为 4.2%和 5%。通过对标准物质的分析验证了所建立的方法，并将其应用于实际样品中铅和镍的测定。