【摘要】 建立了导数 -原子捕集 -火焰原子吸收光谱技术测定中草药中痕量银的新方法 ,主要研究了捕集管位置、捕集时间、火焰性质、导数仪灵敏度档等因素对方法灵敏度的影响 .结果表明 ,在 10mV/min导数灵敏度档下 ,捕集时间为 1min ,银的特征质量浓度为 0 .82 2 μg/L ,灵敏度较常规火焰原子吸收提高 1～ 2个数量级 .利用本方法成功地测定了麻黄、柴胡、升麻和甘草中的痕量银 ,回收率为 92 .2 %～ 10 8.6% .更多还原

【Abstract】 A method for the determination of silver in several kinds of Chinese herbs by derivative atom-trapping flame atomic absorption spectrometry(D-AT-FAAS) with an improved coolant quartz-tube has been proposed. The factors influencing the sensitivity of D-AT-FAAS and the linearity of working curve were examined. The detection limits and sensitivities of the method were enhanced by 1 and 2 orders of magnitude, respectively, compared with those of conventional flame atomic absorption spectrometry. Silver in several Chinese herbs has been successfully determined with the recoveries of 92.2%～108.6%更多还原