A simple and novel method for the colorimetric detection of Co2+ was developed based on controlling the oxidation level of methylene blue (MB). After a complex was formed between MB, 2-aminothiophenol (ATP) and copper nitrate (MB-ATP-Cu2+), the sensing of Co2+ showed high selectivity. The mechanism of sensing has also been discussed.
Z. Liu, X. Jia, P. Bian and Z. Ma, Analyst, 2014, 139, 585 DOI: 10.1039/C3AN01845H
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