硫磺软膏含量测定法在《中国药典》1990年版[1]及《解放军制剂规范》1991年版[2]中均采用加入5％亚硫酸钠溶液回流，然后以碘标准液直接滴定的方法。其终点的判定均为淀粉指示液变为蓝色。笔者在工作中发现上述方法存在一定不足之处，即终点判断不准．因而易出现较大误差，尤其 Determination of sulfur ointment in the “Chinese Pharmacopoeia” 1990 edition [1] and “People’s Liberation Army Code of Specification,” 1991 edition [2] are added by adding 5% sodium sulfite solution reflux, and then titration with iodine standard solution. The end of the judgment of starch indicator solution turns blue. The author found in the work of the above methods there are some shortcomings, that is not allowed to judge the end point. Thus prone to greater error, especially