| 微波消解-分光光度法测定茶叶中铜的含量 |
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| 引用本文： | 李兴扬,夏明伟,李贺.微波消解-分光光度法测定茶叶中铜的含量[J].应用化工,2014(9):1734-1736. |
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| 作者姓名： | 李兴扬 夏明伟 李贺 |
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| 作者单位： | 安徽工程大学 生物与化学工程学院,安徽 芜湖,241000 |
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| 基金项目： | 安徽高校省级科学研究项目(KJ2012B025)；安徽工程大学青年教师科研资助计划 |
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| 摘 要： | 采用微波消解法预处理茶叶样品,利用二乙基二硫代氨基甲酸钠(DDTC)分光光度法测定其中铜的含量,确定了最大吸收波长、显色剂用量、显色时间、pH值、消解工艺和掩蔽剂等条件,和干法灰化法测定的结果进行对比,本方法具有灵敏度高、精密度好、耗时少、操作简单等优点,相对标准偏差(n=6)在2.2%~5.1%,加标回收率在98.6%~101.3%,结果满意。
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| 关 键 词： | 微波消解 茶叶 分光光度法 铜 DDTC钠盐 |
Determination of trace copper in tea-leaves by spectrophotometry with microwave assisted digestion |
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| LI Xing-yang,XIA Ming-wei,LI He.Determination of trace copper in tea-leaves by spectrophotometry with microwave assisted digestion[J].Applied chemical industry,2014(9):1734-1736. |
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| Authors: | LI Xing-yang XIA Ming-wei LI He |
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| Affiliation: | (College of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu 241000, China) |
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| Abstract: | Samples of tea-leaves were digested by microwave assisted digestion, and trace copper in the so- lutions were determined by spectrophotometry with sodium diethyl dithiocarbamate. The effects of the max- imum absorption wavelength, the volume of chromogenic reagent, reaction time, pH value, digestion proce- dure and masking agents were studied. Compared with the method of dry ashing, the established method has good sensitivity and precision, less time-consuming and simple operation. Under the optimum condi- tions, values of RSD＇ s （ n = 6） of were found in the range of 2.2% ~ 5.1%, and values of recovery were found in the range of 98.6% ~ 101.3%. The proposed method was used in the local tea-leaves with satis- factory results. |
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| Keywords: | microwave assisted digestion tea spectrophotometry copper sodium diethyl dithiocarbamate |
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