IP 499: Determination of aromatic carbon content of lubricant mineral base oils and middle distillate petroleum fractions - Carbon-13 nuclear magnetic resonance (NMR) spectroscopy method

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  • Method adopted/last revised: 2011
  • Method reapproved: None
  • REF/ISBN: IP499-2935996
  • Status: Current
  • First printed in STM books: January 2011

Scope

This standard specifies procedures for determining the aromatic carbon content of mineral base oils within the range of 0,6 % mole to 13,8 % mole, and of middle distillates within the range of 1,8 % mole to 41,5 % mole. The standard does not determine the concentration of aromatic carbon in these materials, but only measures the sum of the aromatic substructures. In 13C nuclear magnetic resonance spectroscopy, no distinction can be made between olefinic and aromatic carbons, and thus this standard is not applicable to petroleum fractions with significant quantities of olefinic compounds.

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