An efficient flow-injection system with on-line ion-exchange preconcentration for the determination of trace amounts of heavy metals by atomic absorption spectrometry |
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Authors: | Zhaolun Fang J Růžička EH Hansen |
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Institution: | Chemistry Department A, Technical University of Denmark, Building 207, 2800 Lyngby Denmark |
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Abstract: | A flow-injection system with on-line ion-exchange preconcentration on dual columns is described for the determination of trace amounts of heavy metals at μg l?1 and sub-μg l?1 levels by flame atomic absorption spectrometry. The degree of preconcentration ranges from 50- to 105-fold for different elements at a sampling frequency of 60 s h?1. The detection limits for Cu, Zn, Pb and Cd are 0.07, 0.03, 0.5, and 0.05 μg l?1, respectively. Relative standard deviations were 1.2–3.2% at μg l?1 levels. The behaviour of the different chelating exchangers used was studied with respect to their preconcentration characteristics, with special emphasis on interferences encountered in the analysis of sea water. |
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