食品科学 ›› 2010, Vol. 31 ›› Issue (14): 225-228.doi: 10.7506/spkx1002-6630-201014051

• 分析检测 • 上一篇    下一篇

凯氏定氮- 电位滴定仪联合快速检测果脯中的二氧化硫

谢艳云,张明明,邓颖妍,孙远明,柳春红*   

  1. 华南农业大学食品学院,广东省食品安全重点实验室
  • 收稿日期:2009-12-03 修回日期:2010-04-13 出版日期:2010-07-15 发布日期:2010-12-29
  • 通讯作者: 柳春红* E-mail:liuch@scau.edu.cn
  • 基金资助:

    广东省科技计划项目(2008B021400007)

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

XIE Yan-yun,ZHANG Ming-ming,DENG Ying-yan,SUN Yuan-ming,LIU Chun-hong*   

  1. Key Laboratory of Food Safety of Guangdong Province, College of Food Science, South China Agricultural University,
    Guangzhou 510642, China
  • Received:2009-12-03 Revised:2010-04-13 Online:2010-07-15 Published:2010-12-29
  • Contact: LIU Chun-hong* E-mail:liuch@scau.edu.cn

摘要:

采用FOSS 2200 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。

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

Abstract:

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.

Key words: sulfur dioxide, auto-Kjeldahl s apparatus, automatic potentiometric titrator, glass distiller

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