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Spectral interferences in the determination of phosphorus in steel by inductively coupled Plasma emission spectrometry is studied by using a computer-controlled, scanning echelle monochromator. There is no direct overlap of an iron line on the phosphorus analysis line, P(I) 213.618
nm, although several iron lines that have not been reported in the literature are observed near the phosphorus line. Scatter light, recombination continuum, and the wing of the Cu(II) 213.598 nm line cause background shift, but the interference can be eliminated by using wavelength modulation
and lock-in amplification. The NO band interference arising from the entrainment of air into the plasma is observed when the outer gas flow rate is below 10 liters/min. The detection limit of phosphorus in steel is 0.0006% in the present method.
Faculty of Engineering, Nagoya University, Chikusa-Ku, Nagoya, 464 Japan
Publication date: March 1, 1983
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The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)