自制氢化物发生器原子吸收光谱法测定微量样品中Bi的含量

DETERMINATION OF BISMUTH IN LITTLE SAMPLE BY FAAS WITH HOME MADE HYDRIDE GENERATOR

氢化物原子吸收光谱法能对多种元素进行痕量级的测定，但存在着不足之处，为此，我们设计并自制了简易的氢化物发生器，制做简单、操作方便、消耗样品少，而精密度、灵敏度、检出限等指标均能满足测定要求。用本装置对微量样品中Ｂｉ进行了测定。本方法检出限Ｄ．Ｌ＝３．６９ｎｇ／ｍＬ。

In order to determine Bi in little sample a simple hydride generator was designed,which was made easily and operated conveniently.The generator consumed sample of 0 5 —1 0mL with the content of Bi of 10—100ng/mL,the precision,senstivity and detection limit were shown to be satisfactory.With this apparatus the Bi in little sample was determined by FAAS and the regression equation c=-30 17+190 6A,relation coefficient r=0 9934,residual standard deviation of A for fixed c,S A C =2 737,standard error of regression S B =4 001 and t test result,where α=0 001,showed that the equation was significant in statistics.The detection limit in this method was 3 69ng/mL.