Authors: Davis, Cheryl L.¹; Smith, Benjamin W.²; Bolshov, Mikhail A.³; Winefordner, James D.²

Source: Applied Spectroscopy, Volume 49, Issue 7, Pages 12A-19A and 863-1062 (July 1995) , pp. 907-916(10)

Publisher: Society for Applied Spectroscopy

Abstract:

A miniature glow discharge (GD) is evaluated as an atom reservoir for laser-excited atomic fluorescence spectrometric measurements of Eu, Y, and Tm. Nanoliter-sized aqueous samples are deposited and dried on the Ni cathode and atomized upon ignition of the GD. The atom population is probed by a copper vapor laser pumped dye laser, and direct-line fluorescence is detected. The optimum chamber pressures and operating currents are 1 Torr and 10 mA for Eu, 2 Torr and 10 mA for Y, and 3 Torr and 40 mA for Tm. The fluorescence temporal profiles are found to consist of short (~20-ms duration) transient spikes, followed by long tails which last more than 60 s as a result of sample redeposition on the cathode surface. The limits of detection (3σ) are 2 fg, 1.2 pg, and 0.08 fg for Eu, Y, and Tm, respectively, with the use of signal area integration over a 6-s duration. Theoretically simulated signals for a particular sample mass, considering the geometry of the GD atomizer, were found to fall within one order of magnitude of those obtained by experiment.

Keywords: Laser excitation; Atomic fluorescence; Glow discharge; Europium; Yttrium; Thalium

Document Type: Research article

DOI: http://dx.doi.org/10.1366/0003702953964705

Affiliations: 1: Department of Chemistry, University of Florida, Gainesville, Florida 32611-2046; present address: Monsanto, The Chemical Group, Gonzalez, FL 32560 2: Department of Chemistry, University of Florida, Gainesville, Florida 32611-2046 3: Department of Chemistry, University of Florida, Gainesville, Florida 32611-2046; Institute of Spectroscopy, Russian Academy of Sciences, 142092 Troitzk, Moscow Region, Russia

Publication date: 1995-07-01

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