Electrophoretic assembly of Sn-Bi film for the voltammetric determination of Cd(II) and Pb(II)

In this work, a Sn-Bi film was successfully fabricated via the electrophoretic deposition (EPD) of nano-Sn powders and nano-Bi powders in an ethanol dispersion medium. Study on film composition showed that a coefficient of proportionality between the mass ratio in the deposited film and that in the suspension was observed for the EPD of Sn-Bi, which controlled the composition of the Sn-Bi film. Therefore, Sn-Bi films with different mass ratios were designed with this linear relationship for the codetection of Cd(II) and Pb(II). Square-wave anodic stripping voltammetry (SWASV) measurements using an in-situ plating strategy were performed after the electrochemical oxidation of Sn and Bi at 0.3 V for 120 s, and the results indicated that the Sn-Bi film with a mass ratio of 0.75 had the best determination ability.

Automated summary

A Sn-Bi film was successfully fabricated via electrophoretic deposition of nano powders, with the film composition controlled by a coefficient of proportionality between mass ratio in the deposited film and suspension. Films with different mass ratios were designed for codetection of Cd(II) and Pb(II), with the best determination ability seen in the film with a mass ratio of 0.75.