“…By addition of NH4OH after the cerium has reacted, the titration can be continued to the copper end point (214). The biamperometric coulometric titrations of nitrite in water, isoniazid, and other compounds with silver(II) (44), organic and pharmaceutical compounds with gold(lll) (43), and of gold(III) with cobalt(Il) in the presence of 1,10-phenanthroline (151) have been described. Gold in alloys with copper and silver has been determined by coulometric titration with copper(l) (143).…”