不同季节的虎杖根茎中8种矿质元素的光谱测定

采用空气-乙炔火焰原子吸收法，测定虎杖根茎的K，Ca，Na，Mg，Fe，zn，Mn，Cu等8种矿质元素的含量。对测定条件进行了实验，选择了最佳电离抑制剂和酸性介质。实验以氯化铯为电离抑制剂，盐酸浓度控制在2％以内，用氯化锶消除磷对Ca的干扰，使吸光值稳定，用标准曲线法进行测定，获得了满意效果。该方法简单、快速、准确，加标回收率为90．5％～108．2％，相对偏差为0．3％～0．7％，适合于植物矿质元素的分析。实验结果表明：虎杖根茎中含有丰富的矿质元素，其中以K，Ca元素含量最高。这与虎杖的药用效果相符。同时，每种元素含量随季节变化而变化，与其生长发育密切相关。

Spectral Determination of the Contents of Mineral Elements in Polygonum Cuspidatum

The present paper reports the determination of mineral elements by FAAS, including K, Ca, Na, Mg, Fe, Zn, Mn and Cu. The best condition for the determination was investigated. The best ionization inhibitor and acidity media were confirmed. The experiment used CsCl to prevent ionization interference, and the concentration of HCl was controlled below 2%. At the same time SrCl prevented interference of P to Ca. So the value of absorbance was stable. The results were obtained by calibration curve method. The analysis method is simple, rapid, accurate and fiting to the determination of mineral elements in plants. The recoveries of the method are 90.5%-108.2%. The relative standard deviations are 0.3%-0.7%. The result show that large amounts of mineral elements are embodied in polygonum cuspidatum. The contents of K and Ca are in conformation with the medical effects of polygonum cuspidatum, and each element is related closely to its growing.