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A large number of certified reference materials (CRMs) are polished and mounted, one by one, on the spark stand. The signals from these samples are recorded and plotted against their certified concentrations.

Example calibration of Mn in Steel/Cast Iron
Copyright © Jobin-Yvon Emission 1999, with permission

A separate calibration is made for each type of material (matrix) being analysed, for example, cast iron, aluminium, etc.

Software allows various types of corrections to improve the fit between the measured signals and the certified concentrations, and hence the accuracy of analysis, eg, spectral interferences, self-absorption.

Authors: Jean Charles Lefebvre, Jobin-Yvon Emission and Richard Payling, Surface Analytical

First published on the web: 15 November 1999.

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