Abstract
A simple and sensitive method for the detection of cadmium ion was proposed based on the electrochemiluminescence (ECL) of thioglycolic acid capped-CdTe quantum dots (CdTe QDs). The ECL of CdTe QDs was firstly quenched by introduction of S2− and was restored due to following addition of Cd2+, on the basis of which, a “turn-on” ECL method for the detection of Cd2+ was demonstrated. The ECL of CdTe QDs exhibited linear response toward Cd2+ concentration in the range from 6.3nM to 3.4μM (R=0.999) with a detection limit of 2.1nM. The proposed assay was simple, sensitive, selective, and practicable in real water samples.
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