Evaluation of the mini-hollow cathode emission source for the analysis of microsamples

Jong Yol Ryu, Ray L. Davis, J. C. Williams, James C. Williams

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

The analysis of very small samples by atomic emission from a hollow cathode discharge source is investigated. Subpicogram detection limits of 0.88, 0.72, 0.38, and 0.70 pg are reported for Li, Na, K, and Ca, respectively, by viewing the excitation from a very small hollow with a custom-built multichannel spectrometer. These detection limits are comparable to those from electrothermal atomic absorption, with the additional advantage of the ability to analyze nonmetals. The technique has adequate sensitivity for the analysis of microsamples of physiological fluids for Na, K, and Ca; similar methods may be successful for Mg, P, and Cl, which are of significant physiological interest. Literature of applications of the hollow cathode as an emission source is reviewed. Instrumentation, operation, and sample preparation procedures are described. Temporal profiles of the emission from very small samples deposited in the hollow and working curves are given.

Original languageEnglish (US)
Pages (from-to)1379-1387
Number of pages9
JournalApplied Spectroscopy
Volume42
Issue number8
DOIs
StatePublished - Jan 1 1988
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation
  • Spectroscopy

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