Authors: Cremers, David A.¹; Radziemski, Leon J.²; Loree, Thomas R.¹

Source: Applied Spectroscopy, Volume 38, Issue 5, Pages 619-747 (September/October 1984) , pp. 721-729(9)

Publisher: Society for Applied Spectroscopy

Abstract:

A laser-generated spark was used to analyze liquids spectroscopically for elemental constituents. The spark was produced directly in liquids by a focused laser pulse of 15 ns duration and an energy of about 45 mJ/pulse. The size, temperature, and electron density of the spark are reported. Emissions from once-ionized and neutral atoms and simple molecules were observed. Limits of detection for Li, Na, K, Rb, Cs, Be, Mg, Ca, B, and Al in aqueous solutions were established with the use of a 10 Hz repetitive single spark (RSS). Most of these elements were only detectable at levels above 1 μg/mL, although the detection limit for Li was 0.006 μg/mL. The relative standard deviation for replicate sample analysis was 4-8%. The detectability of some species was enhanced with the use of a 10 Hz repetitive spark pair (RSP): a pair of sparks separated in time by about 18 μs. The detection limits for B/H₂O with the RSP and the RSS were 80 and 1200 μg/mL, respectively. Species were also detected in organic solvents and in flowing samples. The laser spark method of liquid analysis would be useful in situations requiring noninvasive monitoring of species at high or moderate concentrations.

Keywords: Emission spectroscopy; Methods, analytical plasma; Laser spark

Document Type: Research article

DOI: http://dx.doi.org/10.1366/0003702844555034

Affiliations: 1: University of California, Los Alamos National Laboratory, Chemistry Division, P.O. Box 1663, Los Alamos, New Mexico 87545 2: University of California, Los Alamos National Laboratory, Chemistry Division, P.O. Box 1663, Los Alamos, New Mexico 87545; present address: New Mexico State University, Physics Dept., P.O. Box 3D, Las Cruces, NM 88003

Publication date: 1984-09-01

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