A sensitive spectrophotometric method for lead determination by flow injection analysis with on-line preconcentration

A new flow injection (FI) system for the determination of Pb(II) at trace level with a preconcentration step and spectrophotometric detection is proposed. It is based on preconcentration of lead ions on chitosan and dithizone–lead complex formation in aqueous medium (pH 9). The chemicals and FIA var...

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Bibliographic Details
Published in:Talanta (Oxford) 2004-05, Vol.63 (2), p.405-409
Main Authors: Di Nezio, Marı́a S, Palomeque, Miriam E, Fernández Band, Beatriz S
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
FIA
Lead
Preconcentration
Spectrometric and optical methods
Spectrophotometric
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Summary:A new flow injection (FI) system for the determination of Pb(II) at trace level with a preconcentration step and spectrophotometric detection is proposed. It is based on preconcentration of lead ions on chitosan and dithizone–lead complex formation in aqueous medium (pH 9). The chemicals and FIA variables influencing the performance of the system were optimized and applied to the determination of lead in natural, well, and drinking water samples. It is a simple, highly sensitive, and low cost alternative methodology. The method provided a linear rage between 25 and 250μgl−1, a detection limit of 5.0ngml−1 and a sample throughput of 15h−1. The obtained results of spiked samples are in good agreement between the proposed method and ICP-AES.
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2003.11.012