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Journal of Automated Methods and Management in Chemistry
Volume 2009 (2009), Article ID 101679, 7 pages
http://dx.doi.org/10.1155/2009/101679
Research Article

Trace Lead Measurement and Online Removal of Matrix Interference in Geosamples by Ion-Exchange Coupled with Flow Injection and Hydride Generation Atomic Fluorescence Spectrometry

Laboratory of photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510631, China

Received 29 March 2009; Revised 12 June 2009; Accepted 15 June 2009

Academic Editor: Peter Stockwell

Copyright © 2009 Chun-Hua Tan and Xu-Guang Huang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A flow injection method has been developed for the direct determination of free available Pb(II). The method is based on the chemical sorption of Pb(II), from pH7 solutions, on a column packed of chelating resin. The retained complex was afterwards eluted with hydrochloric acid followed by hydride generation with reduction by tetrahydroborate. The preconcentration system proposed in this paper allows the elimination of great part of the saline content in the sample. A thorough scrutiny was made for chemical variables and FI parameters. With a sampling volume of 10.5 mL, quantitative retention of Pb (II) was obtained, along with an enrichment factor of 40 and a sampling frequency of 15  h − 1 . The detection limit, defined as 3 times the blank standard deviation (3 𝜎 ), was 0.0031 ng m l − 1 . The precision was characterized by an RSD value of 3.78% (at the 4 ng· m l − 1 level, 𝑛 = 1 1 ). The developed method has been applied to the determination of trace Pb in three standard reference materials. Accuracy was assessed through comparing the results with the accepted values.