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Glutathione-capped Mn-doped ZnS quantum dots as a room-temperature phosphorescence sensor for the detection of Pb(2+)
Jialing Chen1, Yaxian Zhu1, Yong Zhang2
1Department of Chemistry, College of Chemistry and Chemical Engineering, Key Laboratory of Spectrochemical Analysis & Instrumentation, Ministry of Education, Xiamen University, Xiamen 361005, China.
Abstract:
The room-temperature phosphorescence (RTP) of glutathione-capped Mn-doped ZnS quantum dots (GSH-Mn-ZnS QDs) was effectively quenched by the addition of Pb(2+). A simple and sensitive RTP sensor for Pb(2+) detection based on the quenching effect was developed. Under the optimal conditions, good linear correlations were obtained for Pb(2+) over a concentration range from 1.0 to 100μg·L(-1), and the detection limit was 0.45μg·L(-1). The established method has been successfully applied for the determination of Pb(2+) in real water samples without complicated sample pretreatment with the recoveries in the range of 95.4%-104.0%.
