凯氏定氮-电位滴定仪联合快速检测果脯中的二氧化硫  

Determination of Sulfur Dioxide in Preserved Fruits Using Auto-Kjeldahl's Apparatus Combined with Automatic Potentiometric Titrator

作　　者：谢艳云[1] 张明明[1] 邓颖妍[1] 孙远明[1] 柳春红[1] 

机构地区：[1]华南农业大学食品学院,广东省食品安全重点实验室,广东广州510642

出　　处：《食品科学》2010年第14期225-228,共4页Food Science

基　　金：广东省科技计划项目(2008B021400007)

摘　　要：采用FOSS2200型全自动凯氏定氮仪-Metrohm 809型自动电位滴定仪联合快速检测果脯中的二氧化硫,全过程只需6min,不仅操作简单,而且大大缩短了分析时间。经统计学检验,该法与国标中的玻璃蒸馏法测定的结果无显著性差异(P>0.05),相对偏差小于0.94%,加标回收率为90.39%～103.40%,样品最低检出限为2.6mg/kg,适合各种固、液体样品大批量的蒸馏检测。A method using FOSS 2200 auto-Kjeldahl＇s apparatus coupled with Metrohm 809 automatic potentiometric titrator was developed to determine sulfur dioxide in preserved fruits.This method is simple,rapid and accurate and the whole process only needs 6 minutes.No significant difference （P〉 0.05） between determination results obtained using Kjeldahl＇s apparatus and glass distiller for distillation was observed.The relative error of this method was lower than 0.94%.Average spike recovery rates for sulfur dioxide in 5 preserved fruits were between 90.39% and 103.40%,and the detection limit was 2.6 mg/kg.Therefore,this method is most suitable for determining sulfur dioxide in solid and liquid food samples.

关 键 词：二氧化硫 全自动凯氏定氮仪 自动电位滴定仪 玻璃蒸馏仪 

分 类 号：TS207.7[轻工技术与工程—食品科学] R155.5[轻工技术与工程—食品科学与工程]