针对氧化法和碘量法测定猕猴桃果酒或发酵醪中SO2含量差距很大的问题,提出了猕猴桃果酒或发酵醪中的Vc干扰碘量法测定SO2结果的假设,并经实验证实:Vc溶液浓度与碘量法测定中碘液的消耗量存在显著的正相关关系,其回归方程为Y=87.604X-30.197,R2=0.999 6;Vc与SO2具有相似的还原性,在碘量法测定可与SO2竞争性的消耗碘标准溶液,造成测定结果虚高;氧化法、碘量法的检测的猕猴桃果酒或发酵醪的SO2结果差异性极显著(P<0.01)。基于该实验结果,建议采用氧化法测定猕猴桃果酒或发酵醪的SO2含量。同时综述了一些学者对SO2含量测定方法的研究结果及使用建议,为类似猕猴桃果酒这些存在干扰因素的样品检测SO2含量提供参考,以减少因方法不当造成的结果差异甚至错误判定。

Because of the significant difference between the content of SO2 in Kiwi wine and that in fermented mash measured by oxidation method,we put forward the hypothesis that the Vc of Kiwi wine or fermented may interfere with the determination of SO2 by iodine titration.This experiment confirmed that the solution concentration of Vc and the standard solution volume of I2 had a significant positive correlation,and the regression equation was Y =87.604 X-30.197,R2= 0.9996.Vc has the similar reducibility with SO2,so Vc competitively consumed the standard solution of I2 with SO2,which caused the artificially high results.The both results of SO2 in Kiwi wine or fermented mash measured by oxidation and iodine titration were significantly different(P < 0.01).Based on the experimental results,it was recommended that the content of SO2 of the Kiwi wine or fermented mash was measured by oxidation.Meanwhile,the paper summarized the researches on the determination method of SO2 and the usage advices from some scholars,which could provide the reference for the measurement of SO2 in samples such as Kiwi wine to reduce the result differences or even wrong judgments due to improper method.