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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
- Method adopted/last revised:
- Method reapproved: None
- REF/ISBN:
- Status: Current
- First printed in STM books: February 2013
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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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