Publication: A simple paper-based approach for arsenic determination in water using hydride generation coupled with mercaptosuccinic-acid capped CdTe quantum dots
Issued Date
2020-06-04
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17599679
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2-s2.0-85091053585
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Mahidol University
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SCOPUS
Bibliographic Citation
Analytical methods : advancing methods and applications. Vol.12, No.21 (2020), 2718-2726
Suggested Citation
Oraphan Thepmanee, Kanlaya Prapainop, Obnithi Noppha, Nuanlaor Rattanawimanwong, Weena Siangproh, Orawon Chailapakul, Kriangsak Songsrirote A simple paper-based approach for arsenic determination in water using hydride generation coupled with mercaptosuccinic-acid capped CdTe quantum dots. Analytical methods : advancing methods and applications. Vol.12, No.21 (2020), 2718-2726. doi:10.1039/d0ay00273a Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/59028
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Title
A simple paper-based approach for arsenic determination in water using hydride generation coupled with mercaptosuccinic-acid capped CdTe quantum dots
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Abstract
This research aims to develop a simple paper-based device for arsenic detection in water samples where a hydride generation technique coupled with mercaptosuccinic acid-capped CdTe quantum dots (MSA-CdTe QDs) as a detection probe was applied to the detection system. MSA-CdTe QDs were coated on a paper strip, inserted into the cover cap of a reaction bottle, to react with the developed arsine gas. Fluorescent emission of the QDs was quenched upon the presence of arsenic in solutions, whereby only a small amount of the MSA-CdTe QDs was required. The excitation and emission wavelengths for fluorescent detection were 278.5 nm and 548.5 nm, respectively. The proposed system provided a limit of detection of 0.016 mg L-1 and a limit of quantitation of 0.053 mg L-1, and a detection range of 0.05-30.00 mg L-1. In addition, the tolerance level of the detection approach to interference by other vapor-generated species was successfully improved by placing another paper strip coated with a solution of saturated lead acetate in front of the detection paper strip. This developed approach offered a simple and fast, yet accurate and selective detection of arsenic contaminated in water samples. In addition, the mechanism of fluorescent quenching was also proposed.