Use of an atmospheric-pressure helium plasma for the introduction of aqueous solutions in flame atomic absorption spectrometry

Abstract

A radiofrequency plasma is struck between a metal electrode and an aqueous solution. The plasma converts the solution into an aerosol, which can then be transported to an atomisation device such as a flame. The effects of discharge power, sample concentration and added electrolytes are described. An examination of the mechanism of aerosol formation indicates that mechanical agitation over the area of plasma contact is the most likely cause.