In order to detect ultra-low-level Cd2+in water,a kind of chemosensor aiming at counter elec-trode and reference electrode towards Cd2+was constructed by three electrodes system consisting of ITO,Pt sheet as well as SCE as working electrode.Meanwhile,the sensitivity,the selectivity,LOD and long-term stability of the as-constructed chemical-sensor were evaluated in CH3COOH solution(pH=4.5)existing Cd2+by differential pulse voltammetry(DPV).The results showed that the as-constructed chemical-sensor had good sensitivity of 24.61 μA/μmol/L.The calibration equation of Cd2+was Y=24.61X+11.145,with the relative coefficient(R2)of 0.994.The limit of detection(LOD)of the as-constructed chemosensor was 0.06 μmol/L.The anti-interference studies of existing heavy metal ions Zn2+,Cu2+,Pb2+and Ag showed that there was no obvious interfere effect on the measurement of Cd2+.Moreover,the results of stability experiment showed that the as-constructed chemosensor had superior stability.Finally,the as-constructed sensor was suitable to determine the concentration of Cd2+in tap water by the analysis of real samples.The results displayed that the as-constructed chemsensor could detect the ultra-low-level Cd2+ in water.
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