摘要
介绍断续流动氢化物发生原子荧光测定饮用矿泉水中硒的方法 ,研究了酸度、硼氢化钾浓度、灯电流、载气流速等对测定硒的影响 ,找出最佳测定饮用矿泉水中硒的条件。方法具有操作简便、快速。
A method for the determination of selenium in mineral water by the intermittent flow hydride generation atomic fluorescence spectrometry was described. Optimum working conditions of the instrument were studied, and the following parameters were found to be suitable for the determination. Height of observation of the atomizer was 10mm. Range of negative high voltage was 300～350V. Current of hollow cathode lamp was 70mA. Flow rate of carrying gas was 300ml·min -1 . Flow rate of shielding gas was 700ml·min -1 . Concentration of potassium borohydrid solution was 7g·L -1 . Acidity of sample solution was 2.5mol·L -1 . Under the optimum conditions, the proposed method was characterized by the following targets: Recovery obtained by the standard addition method was 94%～102%. Corrlation coeficient of linearity of standard curve was 0.9998. Detection limit (3 S/b ) 0 14ng of selenium per ml of solution, RSD (at the concentration level of 13.5ng·ml -1 , n =11) was 1.12%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2002年第8期398-399,401,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
断续流动
氢化物发生原子荧光法
测定
饮用矿泉水
硒
Atomic fluorescence spectrometry (AFS)
Intermittent flow
Hydride generation
Selenium
Mineral water
