Carbon Internal Standard in the Spectrochemical Analysis of Lubricating Oil
The spectrographic analysis of lubricating oil for both wear metals and oil additive metals by the rotating disc procedure without the use of a buffer-internal standard is presented in this paper. In addition to the procedures used, the accuracy of the method is measured in terms of precision, comparison with other methods using round robin tests, and a determination of a confidence level in measuring engine wear based on actual engine tear-down inspection levels.
Some experimental work indicates that the carbon in the oil sludge formed on the graphite disc is the source or part of the source of the 2296.89 CIII line. Limited tests indicate that this 2296.89 CIII line could be used as the internal standard in the emission spectrographic analysis of other liquid organic materials for trace materials, and other corrosion inhibitor metals such as boron, sodium, and chromium.
KeywordsGraphite Electrode Base Stock Round Robin Test Spectrochemical Analysis Carbon Line
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