容量法测定氯通常采用加过量硝酸银,以高铁为指示剂用硫氰酸钾反滴,或在氯化高汞存在下以苯肼羧基偶氮苯为指示剂用硝酸银滴定。前者由于反滴而且终点指示不明显,所以误差较大;后者使用汞盐污染环境。近年来以离子选择性电极作指示电极进行电位滴定已有不少报。本文是以硫 Volumetric determination of chlorine is usually used to add excess silver nitrate to high-speed rail as an indicator with potassium thiocyanate anti-drip, or in the presence of chlorinated high-quality phenylzinccarbazobenzene as indicator with silver nitrate titration. The former due to the anti-drip and the end of the indication is not obvious, so the error is greater; the latter use mercury salt pollution of the environment. In recent years, ion selective electrode as the indicator electrode for potential titration have been reported. This article is based on sulfur