Correction of matrix effects in inductively coupled plasma atomic emission spectrometry by interactive power adjustment

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Abstract
An important class of matrix effect in inductively coupled plasma atomic emission spectrometry is apparently caused by matrix-induced changes in excitation conditions in the plasma, as spectral lines are affected to an extent that depends on their excitation potentials. A change in the r.f. power supplied to the plasma produces a similar effect. This similarity has been used to compensate for matrix effects by means of an automatic increase in forward power. Excitation conditions were monitored by the sensitivity of a reference line. Matrix effects on most of the lines studied were reduced to a small level by the method, which is termed “interactive power adjustment.”

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