火焰原子吸收法测定钢铁中钴时的背景吸收及消除

Background Absorption and its Correction in the Determination of Co in Steel with Flame Atomic Absorption Spectrometry

对于背景校正装置的原子吸收分光光度计，用火焰原子吸收法测定钴时，由于铁等有背景吸收（指铁的背景通过吸收池以后的背景，称为背景吸收），故无法用标准加入法测定钢铁中低含量钴。本文对测钴时的背景吸收及铁的干扰做了详细的研究，用金２４２．８ｎｍ谱线做为测钴时背景吸收校正线，可完全扣除背景吸收。用标准加入法测定了钢及高温合金中低含量钴。

In this paper,a study of background absorption and interference of Fe in the determination of Co with flame atomic absorption spectrometry was done.The influence of background absorption on Co 240 7 nm could be completely eliminated when Au 242 8 nm was used as a background correction line,and the results of the determination of micro amount Co in iron and high alloy steel with standard addition method were satisfactory.The mechanism of background absorption and interference was also discussed.