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dc.contributor.authorPungjunun K.
dc.contributor.authorChaiyo S.
dc.contributor.authorJantrahong I.
dc.contributor.authorNantaphol S.
dc.contributor.authorSiangproh W.
dc.contributor.authorChailapakul O.
dc.description.abstractA multistep paper-based analytical device (mPAD) was designed and applied to the voltammetric determination of total inorganic arsenic. The electrodeposition of gold nanoparticles on a boron-doped diamond (AuNP/BDD) electrode and the determination of total inorganic arsenic is accomplished with a single device. Total inorganic arsenic can be determined by first reducing As(V) to As(III) using thiosulfate in 1.0 mol L−1 HCl. As(III) is then deposited on the electrode surface, and total inorganic arsenic is quantified as As(III) by square-wave anodic stripping voltammetry the potential range between −0.25 V and 0.35 V (vs. Ag/AgCl), best at around 0.05 V. Under optimal conditions, the voltammetric response for As(III) detection is linear in the range from 0.1 to 1.5 μg mL−1 and the limit of detection (3SD/slope) is 20 ng mL−1. The relative standard deviation at 0.3, 0.7 and 1.0 μg mL−1 of As(III) are 3.6, 4.3 and 3.3, respectively (10 different electrodes). The results show that the assay has high precision, a rather low working potential, and excellent sensor-to-sensor reproducibility. The method was employed to the determination of total inorganic arsenic in rice samples. Results agreed well with those obtained by inductively coupled plasma-optical emission spectroscopy (ICP-OES). [Figure not available: see fulltext.]. © 2018, Springer-Verlag GmbH Austria, part of Springer Nature.
dc.titleAnodic stripping voltammetric determination of total arsenic using a gold nanoparticle-modified boron-doped diamond electrode on a paper-based device
dc.identifier.bibliograpycitationMicrochimica Acta. Vol 185, No.7 (2018)
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