Der einfluss von thioharnstoff in spurenkonzentrationen auf die abscheidung von Cu(II) and der mit tri-n-butylphosphat bedeckten Hg-oberfläche

Thiourea, like some nucleotides and certain amino acids in a relatively narrow potential region, shows catalytic properties for the transfer of Cu(II) ions through an adsorbed layer of tri-n-butyl phosphate (TBP). In the trace region between 5×10^?8M and 2×10^?5M thiourea forms current peaks whose height is proportional to the thiourea concentration in solution. In favourable cases, if thiourea is present with e.g. adenosine-5′-diphosphate (ADP) two peaks appear beside one another. It is supposed that the formation of an adsorption complex is the cause of the development of these peaks.