Abstract
Two well-defined prewaves of cobalt(II) in the presence of dimethyldithiocarbamate (Me 2DTC) in a medium containing ammonia (borax-NH 4Cl and NH 4OH-NH 4Cl buffer) are observed. The effect of gelatine, Me 2DTC, cobalt(II), ammonium hydroxide and ammonium chloride concentration, mercury reservoir height, buffer capacity, pH and temperature on the prewaves are described. In addition, the characteristics of the current-time and electrocapillary curves are shown. This allows to propose a mechanism where the cobalt(II) prewaves are produced by cobalt(II) complexes with Me 2DTC. In these complexes, the cobalt(II) and Me 2DTC are in the relationship 1:1 and 1:2 for the first and second prewave respectively. A value of the rate constant for the formation of the first prewave catalytic complex of 6.0 x 10 6 lmol −1 s −1 has been found at 20°C.
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