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投稿时间:2014-09-19
投稿时间:2014-09-19
中文摘要: 建立了用离子色谱同时测定茶叶中的 F-、Cl-、NO2-、NO3-、SO42- 5 种重要阴离子的分析方法。以 Ionpac AS11 为分 离柱、AG11 为保护柱、NaOH 等浓度洗脱,以普洱绿茶为样品,考察了不同的回流时间,提取液体积,筛目大小对茶叶提 取率的影响,其他 3 种茶叶作为推广。结果表明:该方法回归方程的线性相关系数在 0.999 1~0.999 8 之间,各组分的检 出限在 0.015 mg/L~0.041 mg/L 之间,RSD 值<5 %,加标回收率在 80.6 %~113.7 %之间。该方法具有快速、灵敏、准确的特 点,用于实际茶叶样品中阴离子的分析,结果令人满意。
Abstract:Conditions for separation and detection of F - , Cl - , NO2 - , NO3 - and SO42 - by gradient ion chromatography with suppressed conductivity detection were studied. NaOH solution as mobile phase,the target component in the extract were separated on AS11 column with AG11 as guard column. Puer tea as samples, investigated different reflux time, extract volume, the impact of mesh size on the tea extraction rate. It was found that the correlation coefficients of linear regression equations were above 0.999 1-0.999 8, and the detection limits of those anions were in the range of 0.015 mg/L-0.041 mg/L, RSD %<5 %, the recoveries of the method were between 80.6 % to 113.7 %. The method offered fast operation, good reproducibility, high sensitivity and accuracy. The method is used for the actual of anion in the tea samples analysis, the result is satisfactory.
keywords: SPE ion chromatograph tea fluoride anion
文章编号:201602027 中图分类号: 文献标志码:A
基金项目:云南民族大学绿色化学与功能材料研究省创新团队项目 (2011HC008); 云南省高校绿色化学新能源与材料科技创新团队项目 (2011UY09);2012 年国家级大学 生 创 新 创 业 训 练 计 划 项 目 (201210691001)
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