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|Title:||Catalytic-adsorptive stripping voltammetry of cobalt in the presence of 2,2′-bipyridine and nitrite|
|Authors:||Gao, Z. |
|Source:||Gao, Z.,Siow, K.S. (1996). Catalytic-adsorptive stripping voltammetry of cobalt in the presence of 2,2′-bipyridine and nitrite. Talanta 43 (2) : 255-261. ScholarBank@NUS Repository.|
|Abstract:||A highly sensitive and selective procedure is presented for the voltammetric determination of cobalt. The procedure involves an adsorptive accumulation of cobalt-2,2′-bipyridine complex on a hanging mercury drop electrode, followed by a stripping voltammetric measurement of the catalytic reduction current of nitrite at -1.25 V (vs. Ag/AgCl). The optimum conditions for the analysis of cobalt include 0.1 M ammonium buffer (pH 8.55-9.25), 2.0-5.0 μM 2,2′-bipyridine, 0.20 M sodium nitrite and an accumulation potential between -0.75 and -0.90 V (vs. Ag/AgCl). An accumulation time of 30 s results in a very low detection limit of 9.5 pM (0.56 p.p.t.) and a linear current-concentration relationship up to 2.0 nM. The relative standard deviation at 0.10 nM is 4.9%. Possible interferences from co-existing ions are also investigated.|
|Appears in Collections:||Staff Publications|
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