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The Determination of Iron in Used Lubricating Oil

Volume 25, Number 6 (Dec. 1971) Page 668-671

Golden, Gerald S.


Iron analyses performed on used gas turbine lubricating oil samples by several variations of rotating disk-spark emission spectrography, atomic absorptiometry, and x-ray fluorescence spectrometry are compared with a quantitative wet chemical technique. The results indicate that emission spectrography with a cobalt internal standard, atomic absorptiometry with a nitrous oxide-acetylene flame, and x-ray fluorescence, both dispersive and nondispersive, are the most reliable instrumental methods. The iron contained in the samples exists primarily as particulates 1 μ or less in diameter.