ISSN:
1618-2650
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract The voltammetric behaviour of a 2-mercaptoimidazole (2-MI) containing carbon paste electrode was studied. When mixed to carbon paste as an electrode modifier, 2-MI can be reduced at negative potentials (−1 V vs. SCE), but it does not give a response in the potential range where Ag(0) is oxidized to Ag(I). Silver could be accumulated from 0.1 mol l−1 acetate buffer onto a 2-MI modified carbon paste electrode without a potential applied; after medium exchange, it was reduced at −1 V vs. SCE in 0.1 mol l−1 acetate buffer solution and determined by differential pulse anodic stripping voltammetry. With suitable preconcentration times, the detection limit was 0.1 μg l−1; a linear relation between current and concentration was found to exist within a range of 0.5 to 1000 μg l−1. In the presence of EDTA, common metal ions have no or only little effect on the voltammetric determination of silver.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00323695
