ICP-AES中基体干扰效应及其机理研究——Ⅲ.有关干扰机理的探讨

MATRIX EFFECTS AND THEIR MECHANISMS IN INDUCTIVELY COUPLED PLASMA ATOMIC EMISSION SPECTROMETRY Ⅲ. The Mechanisms for The Matrix Effects

本文对ICP-AES中一些基体干扰现象的机理进行了讨论。指出ICP低观察区域的增感效应是基体元素电离产生的离子和电子共同发挥作用的结果,基体对分析谱线的零干扰点主要与基体元素特性有关;A1元素在低观察区域对碱土金属元素的抑制效应仍是一种溶质挥发干扰。

The mechanisms for the matrix effects in ICP-AES were discussed by combining the spatial distribution of matrix effects, the experimental degree of analyte ionization and the excitation temperature. The enhancement effect in the low regions of ICP resulted from both the electrons and the ions in the central channel. The positions of the 'noninterference' points from enhancement to depression of matrices on analyte signals are mainly related to the characteristics of matrix elements. The enhancement effect observed in the tail flame of ICP may result from ion-electron recombination and the depression effects of aluminum on the alkali earth elements may result from the solute vaporation interference.