An electroactive carbon-paste electrode based on ap-dichlorobenzene ex
tract of iridium 4-phenyl-8-mercaptoquinolinate has been developed for
determining iridium(III). The detection limit of Ir(III) in the prese
nce of excess copper, nickel, silver, gold, platinum, palladium, ruthe
nium, rhodium, and osmium ions is 3 x 10(-10) M.