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Abstract
A novel method for the determination of trace amounts of lead(II), based on the resonance Rayleigh scattering (RRS) technique, has been developed. In neutral solution, in the presence of TX‐100, lead(II) can react with 1‐(2‐pyridylazo)‐2‐naphthol (PAN) to form a chelating complex, resulting in a significant enhancement of RRS intensity. The characteristics of the RRS spectrum of the chelating complex, the influencing factors, and the optimum conditions of the reaction have been investigated. The calibration graph showed a good linearity over a concentration range of 3.0×10−5∼1.2×10−4 µg/mL with a detection limit for lead(II) of 2.5×10−5 µg/mL. The method exhibits high sensitivity and selectivity and has been successfully applied to the determination of trace amounts of lead(II) in tap water.
Acknowledgments
This project is supported by the Municipal Science Foundation of Chongqing City (2002‐7472) and the Doctor Foundation of Southwest China Normal University (2003‐11).