EI 560


Determination of silicon, chromium, nickel, iron and copper in used greases Wavelength dispersive X-ray fluorescence spectroscopy methodThe Energy Institute / 2008

Scope This Standard specifies a procedure for the determination of the silicon, nickel, chromium, iron and copper content of used lubricating greases by wavelength dispersive X-ray fluorescence spectrometry. The concentration ranges that this method covers are: Element Range mg/kg Silicon 1 to 220 Nickel 1 to 220 Chromium 1 to 180 Iron 10 to 3500 Copper 1 to 155 NOTE 1 - This standard is suitable for the condition monitoring of machinery by the analysis of the wear metals in the lubricating grease. This standard is designed for trend analysis of the elements listed. The precision shown for each element obtained from a round robin study is supplied to provide indicative performance on repeatability and reproducibility. Due to the inhomogeneous nature of the samples a high variance can be expected thus individual measurements should not be used in isolation but as a measure of trend. NOTE 2 - Results obtained from ICP-OES determinations of the same round robin samples indicated that XRF measurements produced higher results for all elements except Fe where the results were comparable.

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