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The detection of copper ions in aqueous solution using electrochemiluminescence (ECL) is reported. ECL is generated by reducing Cu 2+ ions to Cu + with hydroxylamine hydrochloride and then complexing with the chelating agent 2,9-dimethyl-1,10-phenanthroline (dmp) to form Cu(dmp) 2+ , followed by oxidation in the presence of tri-n-propylamine (TPrA). The ECL intensity...