A screen-printed carbon electrode modified with a chitosan-based film for in situ heavy metal ions measurement

A screen-printed carbon electrode modified with a chitosan-based film for in situ heavy metal ions measurement ( Vol-3,Issue-2,March - April 2018 )

Author: Kuo-Hui Wu, Je-Chuang Wang, Shin-Yi Yu, Bing-De Yan

ijeab doi crossref DOI: 10.22161/ijeab/3.2.1

Keyword: Heavy metal ion, Lab chip sensor, Square-wave anodic stripping voltammetry, in situ measurement.

Abstract: SEM images and FTIR data of the working electrode surface showed that Mn+ ions were adsorbed on chitosan (Chit) and crosslinked chitosan-carbon nanotube (Chit-CNT) films. XPS revealed that chelation of Mn+ ions with the –NH2/–OH groups from chitosan, –COOH group from carbon nanotubes, and aqua ligands represents a possible structure of the active Mn+ species in the Chit-based film. The electrochemical behaviors of the Chit-based film modified screen-printed carbon electrode (SPCE) were characterized for individual and simultaneous detection of Cu2+, Pb2+, Hg2+, Zn2+, Cd2+, and As3+ ions. For individual detection, the concentration range was 0.50–3.00 ppm with a detection limit of 0.4 ppm for Cu2+; 1.0–4.0 ppm with a detection limit of 0.5 ppm for Pb2+; 1.0–5.0 ppm with a detection limit of 0.8 ppm for Hg2+. For simultaneous detection, the lab chip sensor was successfully used to determine the concentrations of Pb2+, Cu2+, Hg2+, and As3+ ions simultaneously.


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