FAAS法测定原生态茶叶中的微量铁

Determination of Trace Iron in Original Ecological Tea by FAAS

[目的]测定原生态雷山绿茶、雷山清明茶、黎平绿茶、黎平清明茶中的微量元素铁含量。[方法]样品经烘干、研磨，湿法消解，用火焰原子吸收光谱法（FAAS）测定微量元素铁。[结果]方法的线性范围为0—5．000μg／ml，标准曲线相关系数r为0．9998，特征浓度为0．0054μg／ml，检出限为0．0370μg／ml，相对标准偏差RSD分剐为0．23％、0．50％、0．55％、0．48％，加标回收率为98．5％～100．8％。[结论]该方法准确度高，精密度好，方法简便，用于实际样品测定，结果满意。

[ Objective ] Trace iron contents in Leishan green tea, Leishan Qingming tea, Liping green tea and Liping Qingming tea were detected. [ Method ] After drying, grinding and wet-way digestion, trace iron content was measured by FAAS. [ Result ] The linear range was 0 - 5. 000 μg/ml with the correlation coefficient of calibration curve （r） being 0. 999 8. the characteristic concentration was 0. 005 4 μg/ml and the detection limit was 0.037 μg/ml. RSD were 0.23% , 0.50%, 0.55% and 0.48% , respectively. The recovery of standard addition was 98.5% - 100.8%. [ Conclusion] The method was simple, high precision and accuracy with satisfactory results.