EI 561


Determination of silicon, chromium, copper, nickel and iron in used grease Inductively coupled plasma atomic emission spectroscopy (ICP-AES) methodThe Energy Institute / 2009

Scope This Standard specifies a procedure for the determination of silicon, nickel, chromium, iron and copper content of used lubricating greases by inductively coupled plasma atomic emission spectrophotometry (ICP-AES). The concentration ranges that this method covers are shown below: Element Range mg/kg Silicon 14 to 240 Nickel 3 to 180 Chromium 1 to 160 Iron 7 to 2880 Copper 2 to 132 NOTE 1 - 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 XRF determinations of the same round robin samples indicated that ICP-AES measurements produced lower results for all elements except Fe where the results were comparable.

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