期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 178, 期 1-3, 页码 566-571出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2010.01.122
关键词
Cadmium; Sulfur; Ionic liquid; Cold vapor generation; 2-Mercaptobenzothiazole; Solid phase extraction
资金
- Shahid Chamran University Research Council [1388]
A novel solid phase extractor for preconcentration of cadmium at ng L-1 levels has been developed. Cadmium ions were retained on a column packed with sulfur powder modified with 2-mercaptobenzothiazole (2-MBT) in the medium of 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim]+PF6-) ionic liquid. The presence of ionic liquid during modification of sulfur enhanced the retention of cadmium ions on the column. The retained cadmium ions were eluted with 2 mol L-1 solution of HCl and measured by cold vapor generation-atomic absorption spectrometry (CVG-AAS). By using reaction cell-gas liquid separator (RC-GLS), gaseous cadmium vapors were produced and reached the atomic absorption spectrometer, instantaneously. The influence of different variables on both processes of solid phase extraction and CVG-MS determination of cadmium ions was investigated. The calibration curve was linear in the range of 10-200 ng L-1 of cadmium in the initial solution with r = 0.9992 (n = 8) under optimum conditions. The limit of detection based on three times the standard deviation of the blank (3S(b), n = 10) was 4.6 ng L-1. The relative standard deviation (R.S.D.) of 25 and 150 ng L-1 of cadmium was 4.1 and 2.2% (n = 8), respectively. The procedure was validated by the analysis of a certified reference material (DORM-3), water and fish 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