Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Rapid Communications
Improvement of Analytical Sensitivity by Ar-N2 Inductively Coupled Plasma in Axially Viewing Optical Emission Spectrometry
Masaki OHATAYuichi TAKAKUKazumi INAGAKIAkiharu HIOKIKoichi CHIBA
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2009 Volume 25 Issue 2 Pages 161-163

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Abstract

The analytical sensitivities of elements were improved by Ar-N2 inductively coupled plasma (Ar-N2 ICP) in axially viewing optical emission spectrometry (OES). A commercially available ICP-OES instrument was used, and only N2 gas was added at flow rates of up to 1.0 L min-1 into Ar plasma gas. A stable Ar-N2 ICP was obtained, and the net signal intensities of elements were enhanced by factors of up to 25 compared to those observed for Ar ICP-OES. The detection limits evaluated were also improved by factors from 5 to 10, especially for elements with relatively higher ionization energies. Moreover, the analytical sensitivities for these elements observed in axially viewing Ar-N2 ICP-OES were superior to those in radially viewing Ar-N2 ICP-OES reported previously. The Ar-N2 ICP is expected to be a useful alternative source for excitation and ionization in axially viewing ICP-OES.

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© 2009 by The Japan Society for Analytical Chemistry
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