IP 346: Determination of polycyclic aromatics in unused lubricating base oils and asphaltene free petroleum fractions - Dimethyl sulphoxide extraction refractive index method

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  • Method adopted/last revised: 1992
  • Method reapproved: 2004
  • REF/ISBN: IP346-2935507
  • Status: Current
  • First printed in STM books: January 1992


This document specifies a method of test for the determination of polycyclic aromatics (PCA) over the concentration range 1-15 % (m/m) in unused additive free lubricating base oils having an atmospheric boiling point of 300 °C minimum at 5 % recovered sample.

This method may apply to PCA concentrations outside this range and to other asphaltene-free petroleum fractions, but the precision has not been determined.

NOTE - For the purposes of this standard, the terms "% (m/m)" and "% (V/V)" are used to represent respectively the mass fraction and the volume fraction.

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