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水体中的氯离子含量可用摩尔法(亦称银盐法或铬酸钾指示剂法)测定。在测定的过程中会产生含氯化银沉淀的废液。为了回收其中的银,笔者曾用锌粉在微酸性介质中跟氯化银反应的方法,取得了银的回收率达95％左右的可喜结果。然而,用该法回收银要消耗一些价格较贵的锌粉,此乃其不足也。为了克服上述方法之不足,笔者改用金属活泼性稍差,极易获得且不用花钱的废铁
Chloride in water can be measured by the molar method (also known as silver salt method or potassium chromate indicator method). In the determination of the process will produce silver chloride precipitation of waste. In order to recover the silver, the author once used the method that the zinc powder reacted with the silver chloride in the slightly acidic medium to obtain the encouraging result that the silver recovery rate is about 95%. However, the method of recovery of silver to consume some of the more expensive zinc powder, this is its lack of too. In order to overcome the above shortcomings, I use the metal slightly less lively, easily available and do not have to spend money scrap