| Abstract: | A sensitive procedure for determination of micro-traces of Co(II) by adsorptive stripping voltammetry is proposed. The procedure exploits the enhancement of the cobalt peak obtained by use of the system Co(II)–dimethylglyoxime–piperazine-1,4-bis(2-ethanesulfonic acid)–cetyltrimethylammonium bromide. Using the optimized conditions, a detection limit (based on the 3 criterion) for Co(II) of 1.2×10–11 mol L–1 (0.7 ng L–1) was achieved. The calibration plot for an accumulation time of 30 s was linear from 5×10–11 to 4×10–9 mol L–1. The procedure was validated by analysis of certified reference materials and natural water samples. |
