Paper

J. Anal. At. Spectrom., 2008, 23, 181 - 192, DOI: 10.1039/b706837a

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Warning indicators for the presence of plasma-related matrix effects in inductively coupled plasma-atomic emission spectrometry

George C.-Y. Chan and Gary M. Hieftje

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Several readily measured parameters were evaluated for their ability to flag the presence of plasma-related matrix effects in inductively coupled plasma-atomic emission spectrometry. Of six plasma-species or analyte-emission-based candidates, two showed positive responses to plasma-related matrix effects. These two, the emission intensity from argon neutral-atomic lines and the spatially resolved vertical pattern of analyte emission, change considerably when matrix effects are present. In addition, the coupling of radiofrequency energy to a probe coil placed inside the ICP torch box correlated strongly with matrix effects. All three parameters show promise as alternatives to commonly used ion/atom emission intensity ratios for indicating the presence of plasma-related matrix effects.

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