The Measurement of Silicon, Tin, and Titanium in Jet-Engine Oil
A wear metal profile is often prepared for each engine. Typically an early wear-in period of high metals concentration is observed, followed by a plateau of low metals concentration [2]. Impending component failure will be indicated by a rapid increase in wear metal concentration, or the sudden appearance of a metal. The metal type and concentration may also indicate to the analyst and engineers which part of an engine is failing. A change in the concentration of sodium for example, may indicate an antifreeze leakage, the increased presence of lead may indicate the wear of bearings in a diesel engine [3].
Flame Atomic Absorption Spectrophotometry for the Analysis of Wear Metals in Oil Samples
An analysis of oils for wear metals (Fe, Cr, Cu, Si, Al) was carried out using atomic absorption spectrophotometry. The analytical methodology and advantages of a background corrected, double beamed spectrophotometer with an adjustable nebulizer are discussed together with the results.
Atomic Absorption Spectrometry of Alkali Metals by Absorption Tube Technique
Using a long absorption tube with a hydrogen-air flame from a ring burner, some effects of the external heating of the tube, the rate of exhaust of the burnt gas, and the hydrogen flow rate on the sensitivity, the detection limit, and the memory effect of alkali metals were studied. The considerable improvement in the sensitivity and the detection limit was attained. Especially the external heating caused the more remarkable improve ment of the detection limit and the sensitivity for the heavier alkali metals examined, while the memory effect was little changed.