Microwave Digestion Followed by Stripping Voltammetric Determination of Lead in Kelp Using Nafion Modified Electrode

A stripping voltammetry method to determine lead in kelp was developed on a nafion modified electrode after microwave digestion.The oxidation peak of lead was well defined at-0.62 V.The influence factors nafion concentration,buffer pH,deposition potential,accumulation time and potential interferences were investigated.The sensor used exhibited linear behavior in the range of 6.0 to 16.0μg/L(0.9984 correlation coefficient) with a detection limit of 0.04μg/L.In addition,this sensor was ultrasensitive and effective even in the presence of several excess potential interfering ions.