Trace metal detection by laser-induced breakdown spectroscopy

Randall L. Vander Wal, Thomas M. Ticich, Joseph R. West, Paul A. Householder

Research output: Contribution to journalArticlepeer-review

111 Scopus citations

Abstract

Laser-induced breakdown spectroscopy (LIBS) has been widely pursued for trace elemental determination in gases, solids, and liquids. Application to liquids has proved problematic due to high spatial confinement of the LIBS plasma and rapid quenching of the excited-state emission. This work presents an alternative approach to trace metal determination in liquids in which 1.0 mL of liquid is deposited onto a carbon planchet and then evaporated, thus transforming the liquid analysis to a solid surface analysis. Using optimized excitation and detection conditions, we have identified spectral regions for sensitive detection of 15 metals (Mg, Al, Si, Ca, Ti, Cr, Fe, Co, Ni, Cu, Zn, As, Cd, Hg, Pb). The limit of detection (LOD) for the technique ranged from 10 ppb to 10 ppm for these elements. A 100 ppb LOD represents detection of 130 picograms of metal (approximately 2 picomoles) in a single measurement calculated from the laser spot size on the sample. Scanning electron microscopy (SEM) images and energy-dispersive X-ray (EDX) spectra of the samples provide insight into the observed reproducibility and linearity of the technique for several of the metals studied.

Original languageEnglish (US)
Pages (from-to)1226-1236
Number of pages11
JournalApplied Spectroscopy
Volume53
Issue number10
DOIs
StatePublished - Oct 1999

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Spectroscopy

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