用等电位间隔电位滴定法计算滴定终点,测定桑葚酒的总酸,避免了直接电位滴定法滴定时间长和两点电位滴定法中两点位置较难确定的问题。用该法测定桑葚酒的总酸含量,加标回收率为96.54%,RSD为0.29%,检出限为0.016 g/L。与国标法比较,方法操作方便,数据处理简单,准确度与精密度均较高。 The end point of titration was calculated by potentiometric interval potentiometric titration and the total acidity of mulberry wine was determined. The problem of long titration of direct potentiometric titration and difficult determination of two positions in two-point potentiometric titration was avoided. The total acid content of mulberry wine was determined by this method. The recoveries were 96.54% with RSD of 0.29% and the detection limit was 0.016 g / L. Compared with the national standard method, the method has the advantages of convenient operation, simple data processing, high accuracy and precision.