增感效应火焰原子吸收光谱法测定铁矿石中的微量铬

Determination of Microamounts of Chromium in Iron Ore by Enhancing Effect Flame Atomic Absorption Spectrometry

提出了增感效应火焰原子吸收光谱测定铁矿石中微量铬的新方法。研究了表面活性剂十二烷基硫酸钠（ＳＤＳ）对铬的增感效果。增感效应可使火焰原子吸收光谱的灵敏度提高２７倍。本法已用于测定铁矿石中的微量铬，检测限为７．０μｇ／Ｌ，回收率为９１．１％～１１５．９％，ＲＳＤ为４．０％。

new method for the determination of trace chromium in iron ore by enhancing effectflame atomic absorption spectrometry is proposed.The enhancing effect of sodium dodecyl sulfate on chromium was investigated.The sensitivity for the determination of chromium was enhanced 27 times ores that of conventiional flame atomic absorption spectrometry.The method has been applied to the determination of Cr in iron ore with satisfactory results.