期刊
TALANTA
卷 68, 期 4, 页码 1065-1070出版社
ELSEVIER
DOI: 10.1016/j.talanta.2005.06.069
关键词
chromium speciation; on-line preconcentration; activated carbon; ETAAS; drinking water
An on-line flow injection (FI) preconcentration-electrothermal atomic absorption spectrometry (ETAAS) method is developed for trace determination of chromium in drinking water samples by sorption on a conical minicolumn packed with activated carbon (AC) at pH 5.0. The chrom ium was removed from the minicolumn with 1.0% (v/v) nitric acid. An enrichment factor (EF) of 35-fold for a sample volume of 10 ml was obtained. The detection limit (DL) value for the preconcentration method proposed was 3.0 ng l(-1). The precision for 10 replicate determinations at the 0.5 mu g l(-1) Cr level was 4.0% relative standard deviation (R.S.D.), calculate with the peak heights obtained. The calibration graph using the preconcentration system for chromium was linear with a correlation coefficient of 0.9992 at levels near the detection limits up to at least 50 mu g l(-1). The method was successfully applied to the determination of Cr(III) and Cr(VI) in drinking water samples. (c) 2005 Elsevier B.V. All rights reserved.
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