离子色谱法及氧化还原滴定法测定食品中二氧化硫残留量  

Determination of residue of sulfur dioxide in food matrices by ion chromatography and redox titration

作　　者：刘佩 林秋凤[1] 刘丹丹[1] 刘嘉琼 LIU Pei;LIN Qiu-Feng;LIU Dan-Dan;LIU Jia-Qiong(Dongguan Institute for Food and Drug Inspection,Dongguan 523808,China)

机构地区：[1]东莞市食品药品检验所,东莞523808

出　　处：《食品安全质量检测学报》2021年第6期2424-2428,共5页Journal of Food Safety and Quality

基　　金：东莞市社会科技发展项目(2019507101571)。

摘　　要：目的建立离子色谱法测定食品中二氧化硫残留量,并与氧化还原滴定法比对。方法样品在酸性条件下通过水蒸气蒸馏法提取,二氧化硫经3%过氧化氢溶液氧化吸收成硫酸根,经阴离子分析柱分离,电导检测器检测,外标法定量。结果离子色谱法与氧化还原滴定法测定结果一致。离子色谱法硫酸根在0.1~10.0mg/L范围内线性关系良好,相关系数r2=0.999,回收率为91.91%~95.64%,相对标准偏差(relative standard deviation, RSD)为6.40%。结论氧化还原滴定法操作简便,成本低,检出限高,但干扰因素多,滴定终点受人为因素影响大;离子色谱法灵敏度高、检出限低、专属性强、自动化程度高等优点,两种方法均适合于食品中二氧化硫残留量的准确测定。Objective To establish a method for the determination of residue of sulfur dioxide in food by ion chromatography, and compare with redox titration. Methods The sample were extracted by steam distillation under acidic conditions. Sulfur dioxide was oxidized and absorbed to form sulfate radical by 3% hydrogen peroxide solution, which separated by ion chromatograph with anion exchange column and determined by conductivity detector, then quantified by external standard method. Results The results of ion chromatography and redox titration were consistent. The linear range of sulfate was 0.10-10.0 mg/L(r2=0.999). The recoveries were 91.91%-95.64%, the relative standard deviation(RSD) was 6.40%. Conclusion Redox titration has the advantages of simple operation, low cost and high in detection limit, but the titration end point is interfered by many factors. Ion chromatography method is sensitive, specific, and automatic, and the detection limit is low. Both methods are suitable for the accurate determination of sulfur dioxide residues in food.

关 键 词：离子色谱法 氧化还原滴定法 二氧化硫残留量 水蒸气蒸馏法 

分 类 号：TS207.3[轻工技术与工程—食品科学] O657.7[轻工技术与工程—食品科学与工程] O655.23[理学—分析化学]