石墨炉原子吸收光谱法测定中成药中砷,铅

本文以HNO3 HClO4 为氧化剂 ,压力消解处理样品 ,氯化钯作测砷基体改进剂 ,磷酸氢二铵作测铅基体改进剂 ,考察了基体改进剂用量、灰化温度、原子化温度以及干扰元素对测定的影响 ,在最佳测定条件下 ,用石墨炉原子吸收光谱法测定了中成药中砷和铅 ,砷和铅测试结果分别为 :线性范围为 0～ 30 0ng·mL-1和 0～ 80ng·mL-1,检测限 3 75ng·mL-1和 1 8ng·mL-1,灵敏度 9 3ng·mL-1和 2 6ng·mL-1,平均回收率 95 7%和99 6 %。方法简单 ,灵敏度高 ,重现性好。

Determination of Arsenium and Lead in Traditional Chinese Medicines by Graphite Furnace Atomic Absorption Spectrometry

The samples were processed by pressure dissociation method and by using HNO3-HClO4 as oxidant. The matrix modifiers were PdCl2 for As and (NH4)2HPO4 for Pb. The effects of matrix modifier quantity, ashing temperature, atomization temperature and element interference on the determination of arsenium and lead were investigated. Under the optimum conditions, arsenium and lead in traditional Chinese medicines were determined by graphite furnace atomic absorption spectrometry. The linear range of calibration curve was 0-300 ng.mL-1 and 0-80 ng.mL-1, the detection limit was 3.75 ng.mL-1 and 1.8 ng.mL-1, the sensitivity was 9.3 ng.mL-1 and 2.6 ng.mL-1, the mean recovery was 95.7% and 99.6%, respectively to As and Pb. The method is simple, rapid, sensitive, accuracy and of high practical application value.