Lead as own luminescent sensor for determination.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (2004-05-19)
Hongying Duan, Xinping Ai, Zhike He
ABSTRACT

In our experiments, it was observed that adding bromide to Pb2+ solution of N,N'-dimethylformamide (DMF), the highly emissive cluster Pb4Br11(3-) can be formed and the fluorescence intensity of the formed cluster is proportional to the concentration of Pb2+, based on which, a novel, simple approach that uses the emission from itself as the sensor for determination of Pb2+ is proposed. Under the optimum conditions, the linear range and detection limit is 1.0 x 10(-7) to 1.0 x 10(-5) mol l(-1) (correlation coefficient r = 0.9997) and 7.6 x 10(-9) mol l(-1), respectively. Foreign substrates effects were also investigated. The proposed method has been successfully applied to the determination of lead in the synthetic samples. The mechanism of the reaction is also studied.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Lead(II) bromide, 99.999% trace metals basis
Sigma-Aldrich
Lead(II) bromide, ≥98%