Matrix interferences observed with a thermospray sample introduction system for inductively coupled plasma atomic emission spectrometry

Abstract

Matrix interferences due to the presence of metallic ions were studied for a thermospray sample introduction system used with inductively coupled plasma atomic emission spectrometry. Corresponding results obtained with a V-groove nebulizer indicated that the interferences were more pronounced in the thermospray system. In the presence of mineral acids (HCl, HClO₄ and H₃PO₄), similar interferences were observed for the thermospray sample introduction system and the V-groove nebulizer. The excitation temperature of the plasma was about 500 K lower when the sample was introduced in the form of a thermospray. The electron density was also lower when using the thermospray system.