Concomitant Effects in a Magnetron Rotating Direct-Current Arc Plasma with Graphite-Furnace Sample Introduction

Author:

Slinkman David1,Sacks Richard1

Affiliation:

1. Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109

Abstract

The effects of the concomitant species Li, K, and Zn on analyte emission line intensities from a magnetron rotating direct-current arc plasma are described. The arc plasma has the form of a radial current sheet which completely covers the end of the graphite anode. The sample vapor from a graphite furnace is forced to pass through the current sheet. The presence of an easily ionized element (EIE) does not significantly alter the sample/plasma interaction. Large increases in emission intensities from both neutral-atom and ion lines of the analyte are observed in the presence of K or Li. This is probably the result of increased electron density in the plasma tail flame. Concomitant species which are not easily ionized have a smaller effect on analyte emission intensities, and either intensity enhancement or suppression effects are observed. Significantly lower detection limits are obtained in the presence of an EIE.

Publisher

SAGE Publications

Subject

Spectroscopy,Instrumentation

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