【摘要】 研究了在原有基础上对原子捕集装置的改进 ,并与导数原子吸收光谱法结合 ,使铜的测定灵敏度有较大提高。在 10mV min灵敏度档下 ,捕集时间为 2min时 ,方法的检出限和特征浓度分别为 0 .5 2和 0 .85μg L,分别较常规火焰原子吸收法改善 1和 2个数量级。利用该法成功测定了甘草、柴胡等 10味中药中的微量铜 ,平均回收率为 94.2 %～ 10 4%。更多还原

【Abstract】 The trapping equipment was modified to simplify the equipment and the operation. And the derivative flame atomic absorption spectrometry (FAAS) combined with atom trapping technique was applied to the determination of copper in Chinese herbs. The characteristic concentration and detection limit for Cu were 0.85 and 0.52 μg/L, respectively, for a 10 mV/min sensitivity range setting and 2 min collection time, which were enhanced by 2 and 1 orders of magnitude compared with the conventional FAAS. The content of trace copper in several Chinese herbs was determined and the recovery was in the range of 94.2%～104%.更多还原