A simple, low-cost pyrene derivative containing a benzilmonohydrazone moiety has been exploited for the selective detection of Cu 2+ by colorimetric, absorption, emission and bio-imaging methods. The sensitivity of the fluorescence based assay is 7.8 nM for Cu 2+ , which is far below the limit mentioned in the World Health Organization.
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Ghorai et al. (2018) studied this question.
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