IP 558: Code of Practice for optimization, sample handling, calibration, and validation of X-ray fluorescence spectrometry methods for elemental analysis of petroleum products and lubricants

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  • Method adopted/last revised: 2023
  • Method reapproved: None
  • REF/ISBN: IP558-2936450
  • Status: Current
  • First printed in STM books: January 2007


This Code of Practice covers information relating to sampling, calibration and validation of X-ray fluorescence instruments for elemental analysis, including all kinds of wavelength dispersive (WDXRF) and energy dispersive (EDXRF) techniques. This Practice includes sampling issues such as the selection of storage vessels, transportation, and sub-sampling. Treatment, assembly, and handling of technique-specific sample holders and cups are also included. Technique specific requirements during analytical measurement and validation of measurement for the determination of trace elements in samples of petroleum and petroleum products are described. For sample mixing, refer to Practice D 5854. Petroleum products covered in this practice are considered to be a single phase and exhibit Newtonian characteristics at the point of sampling.

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