氢化物发生原子吸收法测定硒

Studies of the Determination of Selenium by Hydride Generation Atomic Absorption Spectrometry

作者使用铁氰化钾作掩蔽剂,有效地消除了氢化物发生原子吸收测定硒中的干扰。推荐的测定最佳条件为:原子化温度800℃,载气流速1.2L/min,测定液中盐酸浓度2mol/L,掩蔽剂浓度1％,还原剂硼氢化钾浓度1％。在该条件下,常见干扰物Cu^(2+)、Ni^(2+)在其浓度为10μg/ml时对测定也无干扰。数理统计研究表明,测定液室温下至少10小时以内是稳定的,硼氢化钾溶液贮于4℃冰箱中至少1周内是稳定的。本方法最小检出量为2ng。

Potassium ferricyanide has a maskingeffect of Cu^(2+), Ni^(2+) and other interferen-tial ions in the determination of selenium byhydride generation atomic absorption spec-trometry.Interference was not oberved inthe determination of 5ng/ml of Se(Ⅳ)in thepresence of 10μg/ml of Cu^(2+)under recommendedconditions.The stability of analyte andpotassium borohydride solutions in storagewas also studied.