Oraphan ThepmaneeKanlaya PrapainopObnithi NopphaNuanlaor RattanawimanwongWeena SiangprohOrawon ChailapakulKriangsak SongsriroteChulalongkorn UniversityMahidol UniversitySrinakharinwirot University2020-10-052020-10-052020-06-04Analytical methods : advancing methods and applications. Vol.12, No.21 (2020), 2718-2726175996792-s2.0-85091053585https://repository.li.mahidol.ac.th/handle/20.500.14594/59028This 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.Mahidol UniversityChemical EngineeringChemistryEngineeringArticleSCOPUS10.1039/d0ay00273a