离子色谱法测定一次性筷子中二氧化硫的含量.pdfVIP

中国卫生检验杂志2007年l2月第l7卷第l2期 Chinese Journal of Health Laboratory Technology，Dec 2007；Vol 17 No 12 2209 【化学测定方法】 离子色谱法测定一次性筷子中二氧化硫的含量 朱国英，管健 (浙江省嘉兴市疾病预防控制中心，浙江嘉兴 314001) [摘要】 目的：建立一次性筷子中二氧化硫的离子色谱测定方法。方法：用0．05％甲醛热缓冲液浸泡样品，4 h后浸泡 完全，用0．22 m滤膜过滤后离子色谱法直接测定s0；一。结果：浸泡液中s0；一在3 d内稳定性好，二氧化硫浓度在0～ 23．O0 mg／L范围内方法的线性关系良好(r=0．9995)，方法的检出限为0．59 mg／kg，相对标准偏差在1．33％～2．05％之 间，回收率在92％一105％之间，与国标法比较两者无显著性差异。结论：离子色谱法快速、灵敏、准确、选择性高，适用于 一 次性筷子中二氧化硫的测定。 [关键词】 离子色谱法；二氧化硫；一次性筷子 [中图分类号】 0657．7 5 [文献标识码】 A [文章编号】 1004—8685(2007)12—2209—03 Determination of sulfur dioxide in disposable chopsticks by ion chromatography Zhu Guo—ying，Guan Jian (Jiaxing Center for Disease Control and Prevention，Jiaxing 314001，China) [Abstract] Objective：To establish a method for determination of sulfur dioxide in disposable chopsticks by ion chromatography．Methods：After immersed with 0．05％ formaldehyde buffer solution(100℃)for 4 hours and filtrated with 0．22 m menbrane，the samples were injected and analyzed．Results：Sulfite Was stabilized in 3 days by adding formaldehyde into sam· ples．The method had good linearity(r=0．9995)for the concentration of sulfur dioxide ranged from 0 to 23．00 mg／L The rates of recovery were between the range of 92％ ～105％ ，with the detection limit of 0．59 mg／kg，and the RSD between 1．33％ ～ 2．05％ ．There was no significant difference between the resuhs by this method and those by the national standard method．Conclusion：The method is fast，sensitive，accurate and higMy selective．Thus it can be used for determination of sulfur dioxide in disposable chopsticks． [Key words] Ion chromatography；Sulfur dioxide；Disposable chopsticks 一 次性筷子方便、快捷，现在无论饭店、餐厅、夜市、路边 储备液，临用时用去离子水稀释100倍。经0．22 m滤膜过 摊，都随处可