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No.8（2005）2.Non-spectral matrix interferences with determination of minor and trace elements in limestone by inductively coupled plasma atomic emission spectrometry
Michihisa UEMOTO
Non-spectral matrix interferences with determination of minor and trace elements in limestone by inductively coupled plasma atomic emission spectrometry (ICP-AES) have been investigated. Limestone contains calcium in a major quantity, which is one of the most potent elements causing matrix effects. A direct nebulization technique was used after digesting samples with acids. Eliminating spectral interferences, minor amounts of iron, aluminum, magnesium, and phosphorus and trace ones of manganese, zinc, copper, cadmium, lead, chromium, and vanadium were determined through the use of a calibration method with a matrix matching procedure. They were also determined without matrix matching one for comparison, and furthermore internal standard methods were investigated. The analytical values were elucidated in view of the spectral lines measured, where signal enhancements were observed for all kinds of elements when atomic lines were selected, its attenuation occurred when ionic ones were selected. This suggests that high energy ionic lines were attenuated, whereas low energy atomic lines were enhanced in the presence of calcium. As the interference behavior is still obscure, matrix matching procedure seems indispensable for complete removal of the matrix effect.
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