Abstract
An analytical method for the particle size independent determination of Al, Cr, Cu, Fe, Mg, Mo, Ni, Pb, Si, Sn, Ti, and Zn in lubricating oils and hydraulic fluids by atomic emission spectrometry and atomic absorption spectrophotometry is presented. Improved analyses of Ag, Cd, and Na were also accomplished. Metal powder suspensions in hydraulic fluids and lubricating oils were reacted with a small amount of an acid mixture containing hydrofluoric, nitric, and hydrochloric acids and analyzed by a DCP emission specrometer. The recoveries of Al, Cr, Cu, Fe, Mg, Mo, Ni, Pb, Si, Sn, Ti, and Zn ranged from 89% to 102% with relative standard devlations from 2% to 12%. In addition to the metal powder suspensions, aircraft, automobile, and diesel truck engine oils and aircraft hydraulic fluids were analyzed by atomic emission spectrometry and flame atomic absorption spectrophotometry. 4 figures, 6 tables.
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