Electrochemical sensor for trace Cd(Ⅱ)based on paper-based imprinting preconcentration
Heavy metal cadmium ion(Cd(Ⅱ))is one of the important indicators of water quality evaluation.An electrochemical sensor for trace cadmium based on paper-based imprinting preconcentration is proposed.Ion imprinting,screen printing,wax printing and electrochemical reduction are organically combined to synthesize paper-based ion imprinted polymer membranes(Cd(Ⅱ)-IIP@paper)and obtain the modified paper-based electrode(rGO/SPCE@paper).By optimizing the experimental conditions such as graphene deposition time,preconcentration time and template ion elution time,it is found that the peak current of Cd(Ⅱ)dissolution shows a good linear relationship with the concentration in the range of 5～100 μg/L,and the detection limit is 0.91 μg/L(S/N =3).The results show that Cd(Ⅱ)-IIP@paper has good repeatability and stability,and the the prepared electrochemical sensor also exhibits good selectivity.It is applied to the detection of Cd(Ⅱ)in actual water samples,and the recovery is 94.0%～104.4%,which has strong practical value.
paper-based ion imprinted polymerspreconcentrationelectrochemical sensorstrace Cd(Ⅱ)detection in water
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