A comparison of inductively coupled plasma torch-sample introduction configurations using simplex optimisation

Abstract

The analytical performance of two sample introduction-torch configurations for inductively coupled plasma atomic emission spectrometry has been optimised using the variable step-size simplex method and signal to background ratio as the criterion of merit. Small but significant improvements in limits of detection were obtained. When the two systems were compared the diameter of the torch injector tube was shown to be vital. The use of a larger bore injector (2 mm i.d.) gave rise to a smaller, more compact plasma with less variation of optimum conditions between elements. The use of a larger bore injector is therefore recommended for multi-element compromise conditions.