期刊
ANALYTICA CHIMICA ACTA
卷 575, 期 1, 页码 126-132出版社
ELSEVIER
DOI: 10.1016/j.aca.2006.05.072
关键词
copper; polychlorotrifluoroethylene; on-line preconcentration; atomic absorption spectrometry
Polychlorotrifluoroethylene (PCTFE) in the form of beads was applied, as packing material for flow injection on-line column preconcentration and separation systems coupled with flame atomic absorption spectrometry (FAAS). Its performance characteristics were evaluated for trace copper determination in environmental samples. The on-line formed complex of metal with diethyldithiophosphate (DDPA) was sorbed on the PCTFE surface. Isobutyl methyl ketone (IBMK) at a flow rate of 2.8 mL min(-1) was used to elute the analyte complex directly into the nebulizer-bumer system of spectrophotometer. The proposed sorbent material reveal, excellent chemical and mechanical resistance, fast adsorption kinetics permitting the use of high sample flow rates up to 15 mL min(-1) without loss of retention efficiency. For copper determination, with 90 s preconcentration time the sample frequency was 30 h(-1), the enhancement factor was 250, which could be further improved by increasing the loading (preconcentration) time. The detection limit (3s) was c(L) = 0.07 mu g L-1, and the precision (R.S.D.) was 1.8%, at the 2.0 mu g L-1 Cu(II) level. For lead determination, the detection limit was CL = 2.7 mu g L-1, and the precision (R.S.D.) 2.2%, at the 40.0 mu g L-1 Pb(II) level. The accuracy of the developed method was evaluated by analyzing certified reference materials and by recovery measurements on spiked natural water samples. (c) 2006 Elsevier B.V. All rights reserved.
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