IP 561: Determination of silicon, chromium, copper, nickel and iron in used grease - Inductively coupled plasma atomic emission spectroscopy (ICP-AES) method

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  • Method adopted/last revised: 2008
  • Method reapproved: None
  • REF/ISBN: IP561-2936450
  • Status: Current
  • First printed in STM books: January 2008


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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