Anodic stripping voltammetry with adsorptive accumulation of amalgam forming metals is proposed and demonstrated for the determination of traces of copper ions in, the presence of benzotriazole, HBTA (an excellent corrosion inhibitor for copper). The accumulation of the metal ions is accomplished, as customary, by adsorption on the mercury electrode of a coordination compound with a suitable ligand. Specifically, copper(II) is reduced to copper(I) and accumulated as the Cu(I)BTA complex on a hanging mercury drop electrode at 0.0 V vs SCE, under convection. Subsequently, copper(I) is reduced to the amalgam by applying a potential step to -0.4 V during 15 s or less. Finally, the potential is scanned in the positive direction and the differential pulse anodic peak of the re-oxidation of Cu(Hg) to Cu(I)BTA is recorded. A 2 min accumulation period provides a detection limit of 3 x 10(-9) M and an analytical curve linear up to 8 x 10(-7) M. Accumulation for 10 min (or more) lowers the detection limit to 8 x 10(-10) M (or lower). The new mode opens alternatives to improve the selectivity of cathodic stripping methods involving amalgam forming metals, and to reconsider ligands that give rise to unsatisfactory cathodic stripping peaks, such as HBTA.