Publication: Anodic stripping voltammetric determination of total arsenic using a gold nanoparticle-modified boron-doped diamond electrode on a paper-based device
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Issued Date
2018
Resource Type
File Type
application/pdf
ISSN
263672
Other identifier(s)
2-s2.0-85048476985
Rights Holder(s)
Scopus
Bibliographic Citation
Microchimica Acta. Vol 185, No.7 (2018)
Suggested Citation
Pungjunun K., Chaiyo S., Jantrahong I., Nantaphol S., Siangproh W., Chailapakul O. Anodic stripping voltammetric determination of total arsenic using a gold nanoparticle-modified boron-doped diamond electrode on a paper-based device. Microchimica Acta. Vol 185, No.7 (2018). doi:10.1007/s00604-018-2821-7 Retrieved from: https://hdl.handle.net/20.500.14740/4036
Abstract
A 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.