A lot of effort has been put into modification of electrode surfaces and electrode materials in an attempt to improve their analytical ability for arsenic detection to achieve a limit of detection lower then the WHO recommended level of 10gL−1 [12–23]. Carbon electrodes, including carbon nanotubes (CNTs), have been widely used in anodic stripping voltammetric (ASV) determinations of a wide range of metal ions [24–29]. However, interactions between the carbon substrate and interferences in real samples