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Highly Hydrophilic Polymer Composite Modified Electrode for Trace Copper Detection Based on Synergetic Electrostatic Attractions and Chelating Interactions
Author(s) -
Wang Jianhui,
Liu Donglin,
Liu Yongle,
Wang Faxiang,
Huang Shouen,
Luo Xin,
Liu Dongmin,
Chen Donger,
Wei Jiaqian,
Ning Jingheng
Publication year - 2020
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.202000025
Subject(s) - nafion , detection limit , copper , carboxymethyl cellulose , metal ions in aqueous solution , electrode , adsorption , electrochemical gas sensor , composite number , electrochemistry , materials science , chelation , voltammetry , inorganic chemistry , metal , chemical engineering , analytical chemistry (journal) , chemistry , sodium , composite material , chromatography , organic chemistry , metallurgy , engineering
A new electrochemical sensor for Cu 2+ detection by square wave voltammetry with high sensitivity has been constructed, based on a composite of sodium carboxymethyl cellulose and Nafion. Starting from these two polymers that are rich of hydrophilic groups in backbones, a highly negative‐charged composite has been easily prepared, which displays outstanding ability to adsorb and enrich Cu 2+ onto the electrode surface through both electrostatic attractions and chelating interactions. After optimizing test conditions, this new sensor exhibits a good linear signal response to Cu 2+ in a concentration range from 1.0 nΜ to 50.0 nM with a limit of detection of 0.6 nM (S/N=3), as well as good anti‐interference for commonly co‐existing metal ions. Besides, this new electrochemical copper sensor has been successfully applied to detect trace Cu 2+ in natural water samples with satisfactory recoveries of 98–104 %. These findings provide a new simple but effective way for the determination of heavy metal ions in environmental pollutants.