广东茶区茶叶含硒量初步调查分析

应用氢化物-原子荧光光谱法测定茶叶中硒含量,通过对消解试剂混配比、介质酸度以及硼氢化钾-氢氧化钾浓度的试验,确定了最优检测条件;并分析了取自广东茶区的35个茶叶样品的硒含量,初步分析该省茶叶含硒状况及开发富硒茶的可行性.结果表明：以混酸配比V（HNO3）∶V（HClO4）为4∶1、盐酸浓度为6.0 mol/L、硼氢化钾浓度为15 g,/L、氢氧化钾浓度2 g/L为茶样硒含量测定最优条件;所采集的35个茶样中都含有微量元素硒,其中有13个茶样含硒量为0.039～0.097 mg/kg,占37.14％;有20个茶样含硒量为0.100～0.197 mg/kg,占57.14％;有2个茶样的含硒量为0....

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Bibliographic Details
Published in广东农业科学 Vol. 41; no. 8; pp. 43 - 46
Main Author 梁春燕 唐颢 罗一帆
Format Journal Article
LanguageChinese
Published 华南师范大学化学与环境学院,广东广州510631 2014
广东省农科院饮用植物研究所,广东广州510640%广东省农科院饮用植物研究所,广东广州,510640%华南师范大学化学与环境学院,广东广州,510631
Subjects
广东茶区
硒
茶叶
茶叶
硒
广东茶区
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Summary:应用氢化物-原子荧光光谱法测定茶叶中硒含量,通过对消解试剂混配比、介质酸度以及硼氢化钾-氢氧化钾浓度的试验,确定了最优检测条件;并分析了取自广东茶区的35个茶叶样品的硒含量,初步分析该省茶叶含硒状况及开发富硒茶的可行性.结果表明：以混酸配比V（HNO3）∶V（HClO4）为4∶1、盐酸浓度为6.0 mol/L、硼氢化钾浓度为15 g,/L、氢氧化钾浓度2 g/L为茶样硒含量测定最优条件;所采集的35个茶样中都含有微量元素硒,其中有13个茶样含硒量为0.039～0.097 mg/kg,占37.14％;有20个茶样含硒量为0.100～0.197 mg/kg,占57.14％;有2个茶样的含硒量为0.229、0.320 mg/kg,接近或达到富硒茶标准.就茶类而言,乌龙茶的平均硒含量最高,绿茶次之,红茶最低,这可能与品种及加工工艺有关.
Bibliography:44-1267/S
Guangdong tea area; tea; selsnium
This paper applied hydride atomic-fluorescence to determine the Selenium content in tea, and determined the optimal conditions by testing digestion reagent mixed ratio, medium acidity and potassium borohydride-potassium hydroxide concentration. Selenium content of 35 tea samples taken from Guangdong tea area was analyzed to investigate preliminarily tea selenium levels and feasibility about developping se-enriched tea in Guangdong province. The results showed that mixed ratio of acid HN03 and HCIO4 of 4：1, hydrochloric acid concentration of 6.0 mol/L, potassium borohydride and potassium hydroxide concentration of 15.0 g/L and 2.0 g/L respectively were the optimal conditions to determine selenium content in tea. All the 35 tea samples contained selenium, selenium content of 13 tea samples was 0.039-0.097 mg/kg, accounting for 37.14%; selenium content of 20 tea samples was 0.100-0.197 mg/kg, accounting for 57.14%, selenium content of two tea samples was 0.229 mg/kg, 0.3
ISSN:1004-874X