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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ngeontae, Wittaya Butwong, Nutthaya Srijaranai, Supalax Burakham, Rodjana |
| Description | Country affiliation: Thailand Author Affiliation: Butwong N ( Materials Chemistry Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand.) |
| Abstract | A hybrid sequential injection-stopped flow injection system was developed for the speciation of arsenic based on the quenching of mercaptoacetic acid capped cadmium sulfide quantum dots (CdS-MAA QDs) fluorescence intensity. The analytical procedure involves the generation of arsine from As(III) by sodium borohydride in acetate buffer medium pH 6.0. The generated arsine (donor stream) diffuses across the PTFE membrane of the gas-diffusion unit into an acceptor stream and then interacts with CdS-MAA QDs. Total arsenic was determined after pre-reduction of As(V) to As(III) with 1% (m/v) mercaptoacetic acid. Concentration of As(V) in the sample solutions can be deduced from the difference of total arsenic and As(III). Optimization of the experimental conditions and instrumental parameters were investigated. Under optimal conditions, limits of detection were 20 µg L(-1) for As(III) and 40 µg L(-1) for As(V). Recoveries in the range 84-103% were obtained from sediment sample. |
| ISSN | 13861425 |
| Volume Number | 97 |
| e-ISSN | 18733557 |
| Journal | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2012-11-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Arsenic Analysis Cadmium Compounds Chemistry Flow Injection Analysis Methods Gases Quantum Dots Sulfides Acetates Borohydrides Buffers Calibration Diffusion Fluorescence Geologic Sediments Hydrogen-ion Concentration Oxidation-reduction Thioglycolates Time Factors Journal Article Research Support, Non-u.s. Gov't Discipline Spectroscopy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Spectroscopy Atomic and Molecular Physics, and Optics Analytical Chemistry Instrumentation |
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