Study of internal standardization for analysis of powdered samples using a theta pinch discharge

Abstract

Theta pinch discharges are capable of sampling ceramics and other refractory substances for atomic emission spectrometry. Previously, only qualitative information has been obtained. Research on the quantitative aspects of this technique has become feasible owing to improvements in the detection system (a charge coupled array detector and échelle spectrometer), and completion of preliminary parametric studies. This initial quantitative study of the direct sampling of powdered samples using single theta pinch discharges reports the shot-to-shot reproducibility [relative standard deviation (RSD) 20–30%], internal standard correlation (RSD, 10–15%), and sampling curves for several elements.