Towards the development of miniaturised and low‐cost sensors for heavy metals detection in water, herein we describe an electrochemical sensor for the co‐detection of lead and cadmium. The sensor was developed using screen‐printed electrode modified with a composite of poly(propylene imine) dendrimer and carbon black. The electrode was modified by drop casting of the carbon black and electrodeposition of the poly(propylene imine) dendrimer. This modified electrode (sensor) was characterised by cyclic voltammetry and electrochemical impedance spectroscopy, revealing improved electrochemical performances. Square wave anodic stripping voltammetry (SWASV) was used to achieve the simultaneous detection of Pb(II) and Cd(II) at trace level, obtaining satisfactory LOD of 3.6 ppb and 15.3 ppb respectively; and sensitivity of 0.49 μA/ppb and 0.57 μA/ppb in tap water.

中文翻译：

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聚（丙烯亚胺）树状聚合物和炭黑修饰的柔性丝网印刷电化学传感器，用于铅和镉共检测

为了开发用于水中重金属检测的小型，低成本传感器，我们在此描述一种用于铅和镉共检测的电化学传感器。该传感器是使用丝网印刷的电极开发的，该丝网印刷的电极是由聚（丙烯亚胺）树枝状聚合物和炭黑的复合材料改性而成。通过滴铸炭黑和电沉积聚（丙烯亚胺）树状聚合物来修饰电极。这种修饰的电极（传感器）通过循环伏安法和电化学阻抗谱进行了表征，显示出改善的电化学性能。采用方波阳极溶出伏安法（SWASV）同时检测痕量水平的Pb（II）和Cd（II），LOD分别为3.6 ppb和15.3 ppb。灵敏度为0.49μA/ ppb和0。