ICP-AES分析法中铁基体非光谱干扰效应的机理研究

A Study of Non-Spectral Interference of Iron Matrix and Its Mechanisms in ICP-AES Analysis

采用电感耦合等离子体发射光谱法研究了浓度为0~5 mg.mL-1的铁基体的非光谱干扰效应。通过计算干扰函数各项的数值及考察各项数值与铁基体浓度的对应关系,初步探讨了铁的非光谱干扰的一些规律,发现铁基体浓度变化对激发温度、电子数密度和电离度并无显著影响,绝大部份分析元素谱线的活度系数项都随铁基体浓度升高而降低,而干扰函数各项对干扰函数的贡献情况,则因离子线和原子线而异,造成这种情况的原因在于二者的电离因子项存在明显的差别。

In the present paper non-spectral Interference of iron matrix whose concentration ranges from 0 to 5 mg·mL-1 has been studied by using ICP-AES.And its mechanisms are discussed through calculating every terms of the interference function and investigating the relation between the values of them and Fe matrix concentration.The results show that in a certain concentration range（0~5 mg·mL-1） Fe matrix has no significant influence upon excitation temperature and electronic number density.Most of the elements＇ activity coefficient terms decreases with the increase of Fe matrix concentration.And the contribution of each term to the interference function is different according to atomic line and ionic line.It is the differencein ionization term between atomic line and ionic line that causes this.