Determination of arsenic based on quenching of CdS quantum dots fluorescence using the gas-diffusion flow injection method |
| |
Authors: | Butwong Nutthaya Noipa Tuanjai Burakham Rodjana Srijaranai Supalax Ngeontae Wittaya |
| |
Institution: | Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand |
| |
Abstract: | 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. |
| |
Keywords: | Arsenic Fluorescence quenching Quantum dots Gas diffusion unit |
本文献已被 ScienceDirect PubMed 等数据库收录! |