IP 561: Determination of silicon, chromium, copper, nickel and iron in used grease - Inductively coupled plasma atomic emission spectroscopy (ICP-AES) method
- Method adopted/last revised: 2008
- Method reapproved: None
- REF/ISBN: IP561-2936450
- Status: Current
- First printed in STM books: January 2008
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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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