Investigation of Deposition and Stripping Phenomena at the Heated Gold Wire Electrode in Comparison to the Rotating Disk Electrode: Copper(II), Mercury(II), and Arsenic(III)

Abstract

It has been investigated how increased temperatures affect the deposition and stripping step during stripping analysis of Cu(II), Hg(II) and As(III). Results obtained at a heated gold wire have been compared to those obtained at a rotating gold disk electrode. The sensitivity has been found to be higher at the hot-wire electrode. The signal-to-noise ratio was also better at the heated gold wire. The lowest Cu(II) concentration detectable was 10−9 mol/L at the heated gold wire compared to 10−7 mol/L at the rotating disk. Comparing the results and executing a protocol consisting of three consecutive scans after one single deposition w/o heat with all three elements showed a quite different behavior. Best signals have been obtained if only conditioning and deposition are done at increased temperature. Deposit is also removed more efficiently during the first scan in this case. Reasons for this are discussed.