期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 166, 期 2-3, 页码 1383-1388出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2008.12.063
关键词
Copper; On-line solid phase extraction; ICP-OES; CAS; Water samples
Copper, as a heavy metal, is toxic for many biological systems. Thus, the determination of trace amounts of copper in environmental samples is of great importance. In the present work, a new method was developed for the determination of trace amounts of copper in water samples. The method is based on the formation of ternary Cu(II)-CAS-CTAB ion-pair and adsorption of it into a mini-column packed with cotton prior applying inductively coupled plasma optical emission spectrometry (ICP-CES). The experimental parameters that affected the extraction efficiency of the method such as pH, flow rate and volume of the sample solution, concentration of chromazurol S (CAS) and cethyltrimethylammonium bromide (CTAB) as well as type and concentration of eluent were investigated and optimized. The ion-pair (Cu(Il)-CAS-CTAB) was quantitatively retained on the cotton under the optimum conditions, then eluted completely using a solution of 25% (v/v) 1-propanol in 0.5 mol L(-1) HNO(3) and directly introduced into the nebulizer of the ICP-OES. The detection limit (DL) of the method for copperwas 40 ng L(-1) (V(sample) = 100 mL) and the relative standard deviation (R.S.D.) for the determination of copper at 10 mu g L(-1) level was found to be 1.3%. The method was successfully applied to determine the trace amounts of copper in tap water, deep well water, seawater and two different mineral waters, and suitable recoveries were obtained (92-106%). (C) 2008 Elsevier B.V. All rights reserved.
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