期刊
MICROCHEMICAL JOURNAL
卷 96, 期 2, 页码 238-242出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.microc.2010.03.008
关键词
Hollow fiber; Supported liquid membrane extraction; Tungsten coil; Electrothermal atomization; Atomic absorption spectrometry; Lead
资金
- Ministry of Education of China [2006BAK03A14]
- National Natural Science Foundation of China [20835003]
Hollow fiber supported liquid membrane extraction (HF-SLME) was used to separate and enrich trace lead from a large volume of 250 mL water sample to a final tiny volume of 30 mu L of 1-octanol, 5 mu L of which was inject into a tungsten coil electrothermal atomic absorption spectrometer (W-coil ET-AAS) for determination of lead. Some important parameters that influenced the extraction and determination were investigated in detail, such as the concentration of ammonium pyrrolidine dithiocarbamate (APDC), pH of sample solution, stirring rate, extraction time, pyrolysis current, atomization current, carrier gas flow rate, as well as interferences. Under the optimized conditions, a practical enrichment factor of 499 and a limit of detection (3 sigma) of 0.2 ng mL(-1) were obtained. The calibration curve was linear in the range of 0.5-10 ng mL(-1). The relative standard deviation (RSD) was 5.6% for five measurements of a 4 ng mL(-1) lead standard solution. The accuracy of this method was examined by the analysis of certified reference water samples (GBW(E)080398 and GSBZ(E) 50009-88) for lead. Finally, the proposed method was applied to the determination of lead in local tap water, pond water and river water, with recoveries in the range of 96-109% for spiked samples. (C) 2010 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据