Direct solution analysis using an arc source incorporating two plasmas rotating in a graphite tube

As a continuation of earlier work on arc sources for the spectrochemical analysis of powdered samples, a source appropriate for multi-element analysis of trace elements in solution has been developed. The nebulized solution to be analysed is introduced into a horizontal graphite tube in the gap between two plasmas rotating in a magnetic field. Both water and ethanol have been used as solvents and the effect of lithium additions on the detection limits for certain elements has been studied. This source provides advantageous conditions for the determination of trace elements present at very low concentrations. Source parameters investigated include a study of the magnetically induced rotation of the plasmas by high speed cine photography, and the temperature distribution within the tube. Both aqueous and ethanol solutions were used and the effect of lithium additions was measured

Powdered sample analysis in a double plasma arc source in a graphite tube

A double plasma d.c. arc burning in a horizontal graphite tube in a magnetic field was developed as a light source for spectrochemical purposes. It was demonstrated experimentally that a prolongation of the residence time of the analyte particles in the plasma contributes to the detection of trace elements at very low concentrations. The influence of varying amounts of added NaCl and of a variable magnetic field on the line intensities of trace elements was investigated