▎ 摘　　要

In the present work, a sensitive, facile and disposable sensing platform for trace analysis of heavy metal ions was developed at the Bi modified graphene-poly(sodium 4-styrenesulfonate) composite film screen printed electrode (GR/PSS/Bi/SPE). The GR/PSS/Bi/SPE improved sensitivity and linearity due to the functionalization of graphene with negatively charged PSS providing more absorbing sites. The detection limit of the GR/PSS/Bi/SPE is found to be 0.042 mu gL(-1) for Cd2+ and 0.089 mu gL(-1) for Pb2+ with linear responses of Cd2+ and Pb2+ in the range of 0.5-120 mu gL(-1). Finally, the practical application was confirmed in real water with satisfactory results.