Abstract
Luminescent particles of lead carboxymethyl cellulose [Pb(CMC)2] that contain luminescent salicyl fluorones (SAF) {[Pb(CMC)2]‐SAF} were synthesized by sol‐gel method, using sodium carboxymethyl cellulose (NaCMC) as precursor and Pb2+ as precipitator. [Pb(CMC)2]‐SAF can emit intense and stable solid substrate–room temperature phosphorescence (SS‐RTP) on filter paper. EDTA (ethylenediaminetetraacetic acid) can chelate the Pb2+ in [Pb(CMC)2]‐SAF, causing it to decompose into aqueous soluble components PbY2–, CMC–, and SAF, and these components can react with Cu2+ to form [Cu(CMC)2]‐SAF, causing decrease of phosphorescence intensity. Based on the facts above, a new method for the determination of trace mercury by SS‐RTP quenching method was established. This method has been applied to the determination of trace copper in human hair and tea samples with satisfactory results.
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