磺胺醋酰钠的含量测定方法有亚硝酸钠法(终点指示有永停法和外指示剂法)、中和法等。永停法指示终点受仪器条件所限,外指示剂法由于多次外试致使供试品损耗而增加误差;中和法采用甲橙—亚甲蓝作指示剂,终点颜色变化不够敏锐,因而 Sulfamylate sodium content determination of sodium nitrite method (end point indicating the permanent stop method and external indicator method), and so on. Permanent stop method indicates the end point subject to instrument conditions, the external indicator method due to multiple external tests led to loss of test samples increased error; neutralization method using methyl orange - methylene blue as an indicator, the end of the color change is not keen, so