食品科学 ›› 2010, Vol. 31 ›› Issue (10): 250-253.doi: 10.7506/spkx1002-6630-201010054

• 分析检测 • 上一篇    下一篇

牛奶中三价铬和六价铬的同时提取和检测方法

李 静,王 雨,陈华宝,梁立娜*   

  1. 戴安中国有限公司应用研究中心
  • 收稿日期:2009-07-09 修回日期:2009-12-11 出版日期:2010-05-15 发布日期:2010-12-29
  • 通讯作者: 李静 E-mail:lijing@dionex.com.cn

Simultaneous Extraction and Determination of Chromium (Ⅲ) and Chromium (Ⅵ) in Milk

LI Jing,WANG Yu,CHEN Hua-bao,LIANG Li-na*   

  1. Application Research Center, Dionex China, Beijing 100085, China
  • Received:2009-07-09 Revised:2009-12-11 Online:2010-05-15 Published:2010-12-29
  • Contact: LI Jing E-mail:lijing@dionex.com.cn

摘要:

建立牛奶中三价铬和六价铬的同时提取和测定方法。前处理过程中一次完成六价铬的提取、有机铬中三价铬的释放、三价铬柱前衍生以及牛奶蛋白沉降。铬的提取效率高,牛奶基体去除效果好,操作简单方便。使用IonPac CS5A 色谱柱可以在8min 内完成牛奶中两种铬的价态分析,三价铬和六价铬分别以PDCA 和DPC 作为络合剂,分别在紫外和可见波长下采用UV-Vis 检测器进行检测,灵敏度高,基体干扰小。为牛奶的质量检测提供了准确实用的方法。

关键词: 三价铬, 六价铬, 离子色谱, UV-Vis 检测, 牛奶质量检测

Abstract:

A method was developed for the simultaneous extraction and determination of chromium (Ⅲ) and chromium (Ⅵ) in milk. One pretreatment process was required for chromium (Ⅵ) extraction, the release of chromium (Ⅲ) from organic chromium, chromium (Ⅲ) pre-column derivatization and milk protein sedimentation, which exhibited simplicity, convenience and high extraction efficiency of chromium. The separation of chromium (Ⅲ) and chromium (Ⅵ) was achieved on an IonPac CS5A column within 8 min. Chromium (Ⅲ) and chromium (Ⅵ) were chleated with PDCA and DPC and were detected with a UV-Vis detector at UV and visible wavelengths, respectively. This work provides an accurate and practical method for milk quality evaluation.

Key words: chromium (Ⅲ), chromium (Ⅵ), ion chromatography, UV-Vis detection, milk quality testing

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