Simultaneous determination of Cd²⁺ and Pb²⁺ was achieved by using graphene oxide/κ-carrageenan/L-cysteine (GO/κ-Car/L-cys) nanocomposite modified glassy carbon electrode (GCE) by Square Wave Anodic Stripping Voltammetry (SWASV). The morphology and functionalization of the prepared nanocomposite were characterized by XRD analysis, Raman spectroscopy, Field emission scanning electron microscopy and FTIR analysis. Under optimum conditions, outstanding linearity was obtained for both Cd²⁺ and Pb²⁺ in the range from 5–50 nM with the detection limits as 0.58 nM and 1.08 nM respectively. The sensitivity calculated from the slope of calibration curve was 1.39 μA/nM and 1.32 μA/nM for Cd²⁺ and Pb²⁺ respectively. We also carried out multiple metal ion detection, interference of anions and surfactants for the detection of Cd²⁺ and Pb²⁺ ions. The modified electrode has been applied to the detection of Cd²⁺ and Pb²⁺ present in water and milk samples, and the accessed results were satisfactory with that of AAS.

通过方波阳极溶出伏安法（石墨烯/氧化角叉菜胶/ L-半胱氨酸（GO /κ-Car/ L-cys）纳米复合修饰玻碳电极（GCE））同时测定Cd ²⁺和Pb ²⁺ SWASV）。通过XRD分析，拉曼光谱，场发射扫描电子显微镜和FTIR分析对制备的纳米复合材料的形貌和功能化进行了表征。在最佳条件下，Cd ²⁺和Pb ^2+均在5–50 nM范围内获得了出色的线性，检出限分别为0.58 nM和1.08 nM。根据校准曲线的斜率计算出的Cd ²⁺和Pb ²⁺的灵敏度分别为1.39μA/ nM和1.32μA/ nM分别。我们还进行了多种金属离子检测，阴离子和表面活性剂的干扰，以检测Cd ²⁺和Pb ²⁺离子。修饰电极已用于水和牛奶样品中Cd ²⁺和Pb ²⁺的检测，获得的结果与AAS令人满意。