Flow injection on-line sorption preconcentration of platinum in a knotted reactor coupled with electrothermal atomic absorption spectrometry |
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Authors: | E Ivanova and F Adams |
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Institution: | (1) Department of Chemistry, University of Antwerp (UIA), B-2610 Wilrijk, Belgium, BE;(2) Fax: +32 3 820 2376; e-mail: adams@uia.ua.ac.be., XX |
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Abstract: | A flow injection on-line sorption preconcentration method for the electrothermal AAS determination of platinum has been developed.
The pyrrolidine dithiocarbamate complexes of either Pt4+ or Pt2+, formed in 0.7 mol L–1 HNO3, are on-line adsorbed on the inner walls of a PTFE knotted reactor and subsequently eluted with methanol. An enhancement
factor of 112 and a detection limit (3 σ) of 10 ng L–1 along with a sampling frequency of 21 h–1 are achieved with a 90 s preconcentration time at a sample flow rate of 8.8 mL min–1. The relative standard deviation is 2.5% for 0.4 μg L–1 Pt. The method has been applied to the determination of platinum in blood samples.
Received: 6 October 1997 / Revised: 26 November 1997 / Accepted: 3 December 1997 |
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