Abstract
The influence of traces of Cu(II), Pb(II), Sn(II), Cd(II), Ag(I), Fe(II), Ni(II), Te(IV) and Au(III) on the stripping process of mercury from graphite electrodes was investigated in thiocyanate media. The addition of Pb(II), Cd(II) or Cu(II) usually improves the detection limit for mercury, though copper(II) at certain concentrations has harmful effects. Iron(II) and nickel(II) can cause severe distortion of the mercury stripping peaks if the deposition potential or pH are not selected correctly. The stripping peaks of silver and mercury overlap at low thiocyanate concentration but are quite well separated at high thiocyanate concentrations. In the presence of gold(III) or tellurium(IV), the formation of intermetallic compounds may cause severe distortions of the mercury stripping peak. The nature of the multiple peaks sometimes observed during anodic oxidation of mercury is explained.
Published Version
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