Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Original Papers
Application of 5,10,15,20-Tetrakis(4-carboxyphenyl)porphine for Cadmium Preconcentration in Flow-Injection System
Krzysztof KILIANKrystyna PYRZYNSKA
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2002 Volume 18 Issue 5 Pages 571-574

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Abstract

The suitability of 5,10,15,20-tetrakis(4-carboxyphenyl)porphine as a complexing agent for the on-line preconcentration of cadmium using an anion exchanger (Amberlite IRA-904) in a microcolumn has been tested. Various parameters which affect complex formation and its sorption, as well as elution into the nebulizer of flame atomic absorption spectrometry (FAAS), were optimized. A 5 × 10-4 mol l-1 reagent was on-line mixed with an aqueous sample solution and flowed through the microcolumn for 2 min. The sorbed complexes were then eluted with 2 mol l-1 of nitric acid into the nebulizer of FAAS. A good precision (2.1% RSD for 40 µg l-1 cadmium) and a high enrichment factor (36) with a detection limit (3σ) of 1.4 µg l-1 were obtained. The achieved analytical results for a standard reference material (SRM 1643d) were in good agreement with the certified values.

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© 2002 by The Japan Society for Analytical Chemistry
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