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A sensitive and selective procedure is presented for voltammetric  determination of cobalt. The procedure involves an adsorptive accumulation of  cobalt pyrogallol red (PGR) complex on stationary mercury drop electrode,  followed by cathodic stripping voltammetry measurement of reduction current  of adsorbed complex at -1.17 V (vs. Ag/AgCl). The optimum conditions for  determination of cobalt include pH 11.0, 35 μM pyrogallol red, an  accumulation potential of -0.9 V (vs. Ag/AgCl) and scan rate 80 mVs-1. The  peak current is proportional to the concentration of cobalt over the  concentration range of 5.0 to 280 ng mL-1 with a detection limit of 1 ng mL-1  with an accumulation time of 140 s. The method was applied for the  determination of cobalt in analytical grade NaCl and water samples

journal of the serbian chemical society

Trace and selective determination of cobalt(II) in water and salt samples using cathodic adsorptive stripping voltammetry in the presence of pyrogallol red