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:
  • Method reapproved: None
  • Status: Current
  • First printed in STM books: February 2013

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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