Adsorption of cyanide-containing species from 5 x 10(-6)-5 x 10(-3) M KAu(CN)(2) solutions in alkaline supporting electrolyte (0.1 M K3PO4) on gold electrodeposits was investigated over a wide potential range (from -1.5 to 1.5 V/SHE) using the radioactive labeling (C-14) method. The results obtained from dicyanoaurate solutions were compared with those obtained from cyanide solutions at the same total ligand (cyanide) concentration. In the potential region between dicyanoaurate reduction and gold oxidation the adsorption Gamma of cyanide-containing species from dicyanoaurate solution lies above that from cyanide solution, but it approaches that from cyanide solution as the rate of cathodic reduction of dicyanoaurate increases. The adsorption Gamma from cyanide solution approaches that from dicyanoaurate solution as the rate of gold anodic dissolution in cyanide solution increases.