作者使用自制的硫化银镀膜电极作指示电极,改银离子标准液为银络离子标准液作滴定剂,从而采用电位滴定法测定制革废液中的硫离子取得成功。这种电位滴定法电位稳定,终点电位突跃大,测定精度在2％以内,误差小于5％(与汞量法比),测定下限可达10ppb;具有经济、方便、快速、准确的特点,适合工厂推广使用。 The authors used homemade silver sulfide coated electrode as the indicator electrode, and changed the silver ion standard solution into a silver ion standard solution for titration. Thus, the potential titration method was used to determine the sulfur ion in tanning waste liquid successfully. The potentiometric titration method has the advantages of stable electric potential, sudden jump of terminal potential, determination accuracy less than 2% and error less than 5% (compared with mercury amount method), and the determination lower limit is up to 10ppb. The method is economical, convenient, fast and accurate, Suitable for factory promotion.