A Simple and Sensitive Flow-Injection On-line Preconcentration Coupled with Hydride Generation Atomic Fluorescence Spectrometry for the Determination of Ultra-trace Lead in Water, Wine, and Rice

WU Hong, JIN Yan, LUO Mingbiao, BI Shuping

doi:10.2116/analsci.23.1109

A Simple and Sensitive Flow-Injection On-line Preconcentration Coupled with Hydride Generation Atomic Fluorescence Spectrometry for the Determination of Ultra-trace Lead in Water, Wine, and Rice

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WU Hong

School of Chemistry and Chemical Engineering, Key Laboratory of MOE for Life Science & State Key Laboratory of Coordination Chemistry, Analytical Center, Nanjing University Department of Chemistry, Xuzhou Normal University
JIN Yan

School of Chemistry and Chemical Engineering, Key Laboratory of MOE for Life Science & State Key Laboratory of Coordination Chemistry, Analytical Center, Nanjing University
LUO Mingbiao

Department of Applied Chemistry, East China Institute of Technology
BI Shuping

School of Chemistry and Chemical Engineering, Key Laboratory of MOE for Life Science & State Key Laboratory of Coordination Chemistry, Analytical Center, Nanjing University

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抄録

A simple and sensitive flow-injection on-line separation and preconcentration system coupled to hydride generation atomic fluorescence spectrometry (HG-AFS) was developed for ultra-trace lead determination in water, wine, and rice samples, with the salient advantages of its minimization of transition-metal interferences and tolerance to an ethanol matrix. A lead hydroxide precipitate was achieved by the on-line merging of a sample and an ammonium buffer solution and collected onto the inner walls of a knotted reactor (KR). Removal of the residual solution from KR was achieved by air flow, and dissolution of the precipitate was carried out by using 0.2 mol l^-1 HCl. With a sample consumption of 11.7 ml, an enhancement factor of 16 was obtained at a sample throughput of 30 h^-1. The limit of detection (3s) was 16 ng l^-1 and the precision (RSD) for 1.0 µg l^-1 Pb was 3.4%.