Determination of alkali metals by laser-induced atomic-ionization in flames

The technique of laser-induced atomic-ionization (AI) in flames has been used for direct determination of Na, K, Rb, and Cs in samples such as water, high-purity alkali metals and their salts and polymeric organosilicon compounds. Different procedures for sample introduction into the flame were stud...

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Bibliographic Details
Published in:Talanta (Oxford) 1987, Vol.34 (1), p.191-196
Main Authors: Chaplygin, V.I., Kuzyakov, Yu.Ya, Novodvorsky, O.A., Zorov, N.B.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
Spectrometric and optical methods
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Summary:The technique of laser-induced atomic-ionization (AI) in flames has been used for direct determination of Na, K, Rb, and Cs in samples such as water, high-purity alkali metals and their salts and polymeric organosilicon compounds. Different procedures for sample introduction into the flame were studied: ( a) the sample was placed onto the cathode of the detector (this gave limits of detection for Na and Cs of 4 × 10 −16 and 2 × 10 −15 g, respectively), ( b) electrothermal vaporization and ( c) aspiration of the sample into the flame. To reduce the interference of SiO 2 in the AI determination of K in polymeric organosilicon compounds (at the level of 10 −3−10 −5%), a procedure involved additional electrical heating of the FID cathode was developed. The efficiency of certain schemes for the laser stepwise and two-photon excitation of atoms was compared for determination of Na.
ISSN:0039-9140
1873-3573
DOI:10.1016/0039-9140(87)80025-5