充氮蒸馏-碘量法测定食品中二氧化硫残留量  

Determination of Residual Sulfur Dioxide in Foods by Nitrogen Filled Distillation and Iodometry

作　　者：王少伟 孙伟 陶飞 戚繁 颜春荣 徐春祥 WANG Shaowei;SUN Wei;TAO Fei;QI Fan;YAN Chunrong;XU Chunxiang(Jiangsu Provincial Institute of Food and Drug Supervision and Inspection,Nanjing 210008,China)

机构地区：[1]江苏省食品药品监督检验研究院,江苏南京210008

出　　处：《食品科技》2023年第9期264-268,共5页Food Science and Technology

基　　金：江苏省市场监督管理局科技计划项目(KJ2023026)。

摘　　要：参考GB 5009.34—2016和GB 5009.34—2022建立了充氮蒸馏-碘量法测定食品中二氧化硫残留量的方法。称取20 g样品加入蒸馏瓶后加入250 mL超纯水和10 mL盐酸(1:1)。以50 mL碳酸钠溶液为吸收液,充氮蒸馏1.5 h后在吸收液中加入50 mL 0.30 mol/L盐酸和淀粉指示剂,用碘标准滴定溶液滴定。采用国标法与实验方法同时测定腐竹和葡萄酒中的二氧化硫,对所得结果进行t检验,P值分别为0.184和0.084,均大于0.05,统计检验差异不显著。在高中低3个浓度水平下,加标香菇样品平均回收率92%~96%,标准偏差为2.8%~5.0%。对江苏省流通领域的4种食品进行抽样检验,结果发现蜜饯和黄花菜的二氧化硫检出率与超标率均较高。结论:可以用碳酸钠溶液作为食品中二氧化硫残留量测定的吸收液。该实验方法安全性好、准确度高、精密度好。With reference to GB 5009.34—2016 and GB 5009.34—2022,a method for the determination of sulfur dioxide residue in food by nitrogen filled distillation and iodometry was established.Weigh 20 g of sample and add it to a distillation flask.Add 250 mL of ultra-pure water and 10 mL of hydrochloric acid(1:1),and use 50 mL of sodium carbonate solution as the absorption liquid.After 1.5 hours of nitrogen filled distillation,add 50 mL 0.30 mol/L hydrochloric acid and starch indicator to the absorption solution,and titrate with iodine standard titration solution.The national standard method and this experimental method simultaneously determine sulfur dioxide in dried bean curd sticks and wine.The results obtained are subject to t test,and the P values are 0.184 and 0.084 respectively,both greater than 0.05.The statistical test difference is not significant.At the three concentration levels of high,medium,and low,the average recovery rate of Letinus edodes samples was 92%to 96%,and the relative standard deviation(RSD)was 2.8%to 5.0%.A sampling inspection was conducted on four types of food in the circulation field in Jiangsu province,and the results showed that the detection rate and exceeding standard rate of sulfur dioxide in candied fruits and daylily were both high.Conclusion:Sodium carbonate solution can be used as an absorbent solution for the determination of sulfur dioxide residues in foods.The method is safe,accurate,and precise.

关 键 词：充氮蒸馏 碘量法 碳酸钠 过氧化氢 二氧化硫残留量 

分 类 号：TS207.5[轻工技术与工程—食品科学]