A highly sensitive electrochemical sensor for Hg2+ based on crosslinked-chitosan/carbon black composites modified glassy carbon electrode
writer：Sai-Li Ding, Hui-Qing Liu*, Xuan Zhang*
keywords：Electrochemical sensors; Hg2+ detection; Chitosan; Conductive carbon black
source：期刊
specific source：Solid State Sciences, 2026, 172, 108153.
Issue time：2025年
Hg2+ is one of hazardous heavy metal ions that continuously threatens the human health. In this work, functional electrode materials were obtained by decorating conductive carbon black (VXC-72R) with formaldehyde crosslinked chitosan (HCHO-CS), and coated on glassy carbon electrode (GCE) to construct a novel electrochemical sensor (HCHO-CS/VXC-72R/GCE) for Hg2+. By taking advantage of the coordination interaction between Hg2+ and imine groups of HCHO-CS, a sensitive and selective electrochemical sensor for Hg2+ was developed based on the differential pulsed anodic stripping voltammetry (DPASV). The present sensor exhibited a wide linear region of 0.01–16.0 μM and a remarkably low detection limit of 0.607 nM. The practical feasibility of HCHO-CS/VXC-72R/GCE sensor was well demonstrated by successful Hg2+ determination application in the lake water and shrimp meat samples, with recovery rates of 89.00–101.20 %.