标准摘要
[中文适用范围]： 游离二氧化硫的测定包括在 pH 值介于 0.7 和 1 之间时对产品进行直接碘量滴定，然后对通过回流沸腾或通过将其游离二氧化硫含量与二氧化硫结合而除去的产品进行空白滴定。 乙醛或丙醛过量。 键合二氧化硫在滴定游离化合物、使产物呈碱性并滴定在酸性介质中用碘水解释放的二氧化硫后测定。 [外文原描述]： The determination of free sulphur dioxide consists in direkt iodometric titration of the product at a pH between 0,7 and 1, followed by blank titration of the product, freed from sulphur dioxide by boiling under reflux or by binding its free sulphur dioxide content with an exess of acetaldehyde or propioaldehyde. The bond sulphur dioxide is determined after titration of free compound, rendering of the produkt alkaline and titration of the sulphur dioxideliberated by hydrolysis with iodine in an acid medium.
英文名称Liquid fruit and vegetable products — Determination of sulphur dioxide content (Routine method)