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茶叶科学 ›› 2005, Vol. 25 ›› Issue (2): 121-125.doi: 10.13305/j.cnki.jts.2005.02.007

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毛细管离子分析法测定茶叶中的锌、锰、铜、铅和镉

舒友琴1, 袁道强2   

  1. 1. 郑州牧业工程高等专科学校,河南 郑州 450008;
    2. 郑州轻工业学院,河南 郑州 450002
  • 出版日期:2005-06-25 发布日期:2019-09-16
  • 作者简介:舒友琴(1963-),女,副教授,硕士,主要从事分析化学教学和科研工作。

Determination of Zn, Mn, Cu, Pb and Cd in Tea by Capillary Ion Analysis

SHU You-qin1, YUAN Dao-qiang2   

  1. 1 Zhengzhou College of Animal Husbandry Engineering, Zhengzhou 450008, China;
    2 Zhengzhou Institute of Light Industry, Zhengzhou 450002, China
  • Online:2005-06-25 Published:2019-09-16

摘要: 用毛细管离子分析(CIA)法测定了茶叶中的锌、锰、铜、铅和镉,在10βmmol/L咪唑,10βmmol/L α-羟基乙酸,pH=4.0的电泳介质中,五种离子在10βmin内得到了分离,用间接紫外法检测,以外标法定量,五元素的线性关系良好,相关系数为0.9973~0.9997,平均回收率在96.4%~104.2%之间,相对平均偏差为2.1%~3.3%,检测限为0.02~0.2βµg/ml。此方法快速简便、准确度高、测定成本低。

关键词: 毛细管离子分析, 间接紫外检测, 茶叶, 锌, 锰, 铜, 铅,

Abstract: Capillary ion analysis(CIA) was used to determine the contents of Zn, Mn, Cu, Pb and Cd in tea. In the solution(pH=4.0) containing 10βmmol/L of imidazol and 10βmmol/L of α-hydroxyacetic acid, Zn, Mn, Cu, Pb and Cd in tea were separated within 10βmin. Zn, Mn, Cu, Pb and Cd in tea were detected at 214βnm by indirect UV, and quantified externally. The calibration curves of five elements showed good linearity .The correlation coefficient were 0.9973~0.9997.The average recoveries were 96.4%~104.2% with RSD of 2.1%~3.3%.The detection limits were 0.02~0.2βµg/ml. The result showed that the method is convenient, rapid, accurate and lower cost. It was used in the determination of tea samples, and satisfactory results could be obtained.

Key words: Capillary ion analysis, Indirect UV detection, Tea, Zn, Mn, Cu, Pb, Cd

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