有机试剂对锶火焰原子吸收光谱分析的增感机理

Enhancement Mechanism of Organic Reagent on Strontium in Flame Atomic Absorption Spectrometry

研究了火焰原子吸收光谱法中甲醇、甲醛、甲酸等6种有机试剂对元素Sr的增感行为,发现甲酸效果最佳。在选定的相对最佳条件下,增感效果高达70%。研究表明,甲酸所产生的增感效应主要在于其与Sr形成甲酸锶,改变了常规原子化机理,提高了火焰原子化效率。这一机理同样适用于甲酸存在下Ca、Ba等元素的火焰原子化。实验表明,甲酸对这两种碱土元素的增感效果分别达到54%和55%。甲酸对Sr的增感应用于高纯BaCO3中Sr含量测定,回收率达到100%～106%。

The enhancement effect of six organic reagents on strontium in the flame atomic absorption spectrometry was investigated. It was found that the enhancing effect of formic acid was achieved as high as 70% on the relative optimum condition while the effect on calcium and barium was 54% and 55%. The enhancement effect of formic acid is mostly because of forming strontium formate. It changes the general atomization mechanism and increases the atomization efficiency. The method was used for the determination of strontium in barium carbonate with 100% -106% recovery.