Journal
TALANTA
Volume 85, Issue 2, Pages 1063-1069Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2011.05.023
Keywords
Arsenic; Fluorescence quenching; Quantum dots; Gas diffusion unit
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Funding
- Office of the Higher Education Commission through the Advanced Functional Materials Cluster of Khon Kaen University
- Rajamangala University of Technology Isan (RMUTI)
- Center for Innovation in Chemistry (PERCH-CIC), Commission on Higher Education, Ministry of Education
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A sequential injection analysis system for determination of arsenic based on hydride generation and fluorescence quenching of mercaptoacetic acid capped cadmium sulfide quantum dots (CdS-MAA QDs) is described. The generated arsine diffused across the PTFE membrane in a gas-diffusion unit and subsequently interacted with CdS-MAA QDs. The parameters affecting the arsine generation and the fluorescence quenching of QDs were studied. Under the optimum conditions, it was observed that a increase in the concentration of As(III) corresponded well to a decrease in fluorescence intensity according to the Stern-Volmer relationship. The extent of quenching was dependent on the concentration of arsenic in the range of 0.08-3.20 mmol L-1, with the detection limit of 0.07 mg L-1. The precision (%RSD) from eight replicates of the determination of As(III) 1.0 mg L-1 was found to be 1.4%. The proposed method was applied to the determination of arsenic in ground water samples with satisfactory recoveries. (C) 2011 Elsevier B.V. All rights reserved.
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