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库仑法测定金已有报道,一般是电生滴定剂直接滴定金.自1965年以来,广泛采用活性炭吸附富集,分离后用氢醌直接滴定Au(Ⅲ).该方法干扰少,但是,氢醌与Au(Ⅲ)的反应速度很慢,直接用氢醌滴定Au(Ⅲ)不仅滴定时间长,滴定终点不明显,重现性差,而且灵敏度低,经过复杂手续制得的试液只能供一次滴定.为此,本文采用加入过量的氢醌与Au(Ⅲ)反应,放置后用电生Br_2回滴过剩的氢醌.本法操作简便,滴定速度快,灵敏度高、处理一份试液样可进行多次滴定.
Coulometric method for the determination of gold has been reported, usually by direct titration of titrimetric titration of gold. Since 1965, activated carbon has been extensively adsorbed and enriched. After separation, the titration of Au (Ⅲ) with hydroquinone is direct. The reaction between quinone and Au (Ⅲ) is very slow. Titration of hydroperoxide directly with Au (Ⅲ) results not only in long titration time but not obvious end point of titration, poor reproducibility and low sensitivity. The test solution prepared through complicated procedures can only provide A titration.To this end, this paper uses excess hydroquinone and Au (Ⅲ) reaction, placed after the Bromophenol back excess hydroquinone.This method is simple, rapid titration, high sensitivity, the treatment of a test solution Sample can be titrated several times.