表面活性剂增敏-火焰原子吸收光谱法测定板蓝根中微量锂

DETERMINATION OF MICROAMOUNTS OF LITHIUM IN RADIX ISATIDEIS BY FLAME AAS USING SURFACTANT AS SENSIBILIZER

摘要: 提出了表面活性剂增敏-火焰原子吸收光谱法测定微量锂.当表面活性剂OP存在时,锂的灵敏度提高35%,以氯化钾、硝酸作消电离剂、释放剂可消除基体物质的干扰,方法的线性范围为0.0-3.3 mg·L-1,特征灵敏度为0.028 mg·L-1/1%.用于中药板蓝根中微量锂的测定.

Abstract: A method of flame atomic absorption spectrometry for the determination of Li in Radix isatideis (Banlangen) was reported.Sensibilization of the surfactants was studied and OP was selected as the sensibilizer.Absorption signal could be increased by a factor of 35%.Linearity was ranged in 0.0-3.3 mg·L-1 of Li.The proposed method was sensitive and convenient and has been applied to the determination of Li in Radix isatideis (Banlangen) with satisfactory results.