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。结果表明院以混酸配比V（HNO3）颐V（HClO4）为4颐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耀0.097 mg/kg，占37.14%；有20 个茶样含硒量为0.100耀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。

Preliminary investigation and analysis on teaselenium content in Guangdong tea area

This paper applied hydride atomic-fluorescence to determine the Selenium content in tea, and determinedthe optimal conditions by testing digestion reagent mixed ratio, medium acidity and potassium borohydride -potassiumhydroxide concentration. Selenium content of 35 tea samples taken from Guangdong tea area was analyzed to investigatepreliminarily tea selenium levels and feasibility about developping se-enriched tea in Guangdong province. The resultsshowed that mixed ratio of acid HNO3 and HClO4 of 4-1, hydrochloric acid concentration of 6.0 mol/L, potassium borohydrideand potassium hydroxide concentration of 15.0 g/L and 2.0 g/L respectively were the optimal conditions to determineselenium content in tea. All the 35 tea samples contained selenium, selenium content of 13 tea samples was 0.039~0.097mg/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, 0.320 mg/kg, approached or reached enriched tea standard(requiredselenium content0.25 mg/kg). Oolong tea samples average selenium content was the highest, followed by green teasample, black tea sample was minimum, which may be related with tea variety and processing technology.