Matrix effects in the x‐ray fluorescence method

Abstract

AbstractThe matrix effects which exist in x‐ray fluorescence analysis are considered, Shiraiwa and Fujino equations being the initial point of these considerations. Matrix effects are divided into two groups: simple and so‐called unusual. Among the simple ones, absorption and enhancement effects are considered. New concepts of ‘absolute’ and ‘relative’ absorption effects are introduced. It is shown that the expressions of simple matrix effects can be easily separated in the Shiraiwa and Fujino equation. Additionally, the unusual matrix effects, including the Birks‐Harris effect and some cases of the Mitchell‐Kellam effects, were found to be well described by certain equations based on the Shiraiwa and Fujino equation, provided the appropriate assumptions were made.