半微量碘量法测定葡萄酒中总二氧化硫含量  

Determination of total sulfur dioxide in grape wine by semi-micro iodimetric analysis

作　　者：周霞 孙芬芳 张玲玲 王延华 殷兰兰 ZHOU Xia;SUN Fenfang;ZHANG Lingling;WANG Yanhua;YIN Lanlan(Department of Food,Haidu College,Qingdao Agriculture University,Laiyang 265200,China)

机构地区：[1]青岛农业大学海都学院食品系,山东莱阳265200

出　　处：《食品与发酵工业》2019年第7期284-287,共4页Food and Fermentation Industries

摘　　要：对葡萄酒中SO_2残留量的直接碘量法测定进行了半微量化改进研究。通过减小取样体积,减弱了有色葡萄酒中色素对滴定终点判断的影响;通过超声振荡加速结合态SO_2的解离,缩短了分析时间;通过加碎冰控制反应温度改进为冰水浴控制,避免了稀释作用对反应的不良影响。经过方法学验证,该方法的精密度良好,相对标准偏差小于1%,准确度较高,回收率在95.0%～100.7%;方法的适用性强,可以测定不同类型葡萄酒中SO_2的含量。使用改进后的方法对四大类别12个品牌的葡萄酒中SO_2残留量进行了检测,结果均低于国家最高限量标准。This study aimed to use semi-micro iodometric analysis to determine total sulfur dioxide in red grape wine. By reducing the sampling volume, influences of pigments in colored wine at titration end points were weakened. Dissociation of bound sulfur dioxide was accelerated by ultrasonic oscillation, leading to shorter analysis time. Ice water bath was used to control the reaction temperature to avoid adverse effects of dilution on the reaction. Methodological verification showed that the improved method had good precision and high accuracy, and its relative standard deviation was less than 1%. Besides, its recovery rate reached 95.0%-100.7%. The method was highly adaptable for determining sulfur dioxide in different types of wine. The residual sulfur dioxide in 12 brands of wine from four categories were determined, and the results showed that they were all qualified referring to the national standard.

关 键 词：葡萄酒 二氧化硫 半微量碘量法 

分 类 号：TS262.6[轻工技术与工程—发酵工程]