花卉微量元素含量分析及测试条件研究

研究了火焰原子吸收分光光度法 (AAS)对花卉的微量元素钙、镁、钴和钾的测定方法 ,为花卉的货架保鲜研究提供参考数据。系统考察了燃助比、燃烧器高度、元素空心阴极灯的灯电流和光谱通带等测试条件对这几种被测元素的影响。实验表明 ,在选定实验条件下 ,Ca在 0～ 5 0 μg·mL-1,Mg在 0～ 80 μg·mL-1,Co在 0～ 4 μg·mL-1,K在 0～ 12 0 μg·mL-1范围内均符合比尔定律 ,相关系数 (r)为 0 9975～ 0 9995。方法操作简便、快速、选择性好 ,准确度和精密度都能满足分析要求。该法用于玫瑰和月季两个花卉品种的分析 ,结果令人满意 ,方法回收率在 97%～ 10 4 %之间 ,相对标准偏差为 1 2 %～ 2 3%。

Determination of Trace Elements in Flowers and Tests of Conditions

The optimum conditions, such as the ratio of fuel gas to combustion-supporting gas, burnerheight, lamp current and band pass, for the determination of trace elements such as calcium, magnesium, cobalt and potassium in flowers were studied by flame atomic absorption spectrophotometry (AAS). The experimental results showed that Beer's law was obeyed in the range of 0-50 microg x mL(-1) for Ca, 0-80 microg x mL(-1) for Mg, 0-4 microg x mL(-1) for Co, and 0-120 microg x mL(-1) for K. The correlation coefficients were in the range of 0.9975-0.9995 under the seleced conditions. Applied to the determination in rose & Chinese rose the method proved to be simple, rapid and selective with satisfactory recovery of 97%-104% and relative standard devition of 1.2%-2.3%.