期刊
TALANTA
卷 265, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.talanta.2023.124784
关键词
Heavy metals; Hemicellulose; Opuntia Ficus Indica; Polysaccharide; Sensors
We aimed to develop an electrochemical sensor for detecting the highly toxic water contaminant divalent metal ion (lead II). A sensor was formed using hemicellulose polysaccharide extracted from the Opuntia Ficus Indica cactus associated with agarose as a sensitive layer on a gold electrode. The sensor demonstrated high sensitivity towards Pb2+ with a detection limit of 1.3 fM, showing a potential application for lead detection in river and sea water.
We aim to develop an electrochemical sensor for a divalent metal ion (lead II), a highly toxic water contaminant. We explore a sensor formed with a hemicellulose polysaccharide extracted from the Opuntia Ficus Indica cactus associated with agarose as a sensitive layer deposited on a gold electrode. This sensor combines the functional groups of hemicellulose that could form a complex with metal ions and agarose with gelling properties to form a stable membrane. The sensor demonstrated a loading ability of Pb2+, with higher affinity compared to other metal ions such as Hg2+, Ni2+, and Cu2+, thanks to the chemical structure of hemicellulose. The detection was measured by square wave voltammetry based on a well-defined redox peak of the metal ions. The sensor shows high sensitivity towards Pb2+ with a detection limit of 1.3 fM. The application in river and sea water using the standard addition method for lead detection was studied.
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