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Title: Enhanced sensitivity and separation for simultaneous determination of tin and lead using paper-based sensors combined with a portable potentiostat
Authors: Pungjunun K.
Nantaphol S.
Praphairaksit N.
Siangproh W.
Chaiyo S.
Chailapakul O.
Keywords: Analytic equipment
Graphite electrodes
Lead compounds
Oxalic acid
Voltage regulators
Bismuth nanoparticles
Enhanced sensitivity
Hexadecyltrimethylammonium bromide
Paper-based analytical devices
Screen-printed graphene electrodes
Simultaneous determinations
Square wave anodic stripping voltammetry
Supporting electrolyte
Tin compounds
Issue Date: 2020
Abstract: Due to similar properties in the electroanalysis of tin (Sn(II)) and lead (Pb(II)), the voltammograms of tin and lead overlap and it is difficult to simultaneously determine these two metals. Herein, we develop a simple fabricated sensor based on a bismuth nanoparticle-modified screen-printed graphene electrode (BiNP/SPGE) on a paper-based analytical device (PAD) for the simultaneous determination of Sn(II) and Pb(II) and combine it with a portable potentiostat. To overcome crossing interference, the use of hexadecyltrimethylammonium bromide (CTAB) can provide improved separation and enhanced sensitivity for Sn(II) and Pb(II) detection in oxalic acid as a supporting electrolyte while using square-wave anodic stripping voltammetry. Under optimal conditions, the linear range of both metals was determined to be 10–250 ng mL−1, and the calculated limit of detection (3SD/slope) was 0.26 ng mL−1 and 0.44 ng mL−1 for Sn(II) and Pb(II), respectively. This sensor was also applied to simultaneously determine Sn(II) and Pb(II) in canned food samples. The results obtained from the portable potentiostat were similar to the results obtained by a standard method. Therefore, the proposed device can be further improved for the realization of a rapid on-site detector for Sn(II) and Pb(II) detection in real samples. © 2020 Elsevier B.V.
ISSN: 9254005
Appears in Collections:Scopus 1983-2021

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