During the production, determination of SO_2 (sulphur dioxide) in dry red wine using potentiometric titration avoids the end-point recognition difficulty compared with using iodometry method.
在生产中利用电位滴定法测定干红葡萄酒中SO_2的含量，避免了直接碘量法终点识别的困难。
2
The potentiometric method or the crystal violet indicator was used to indicate the end-point.