IP 156: Determination of hydrocarbon types in petroleum products - Fluorescent indicator adsorption method

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  • Method adopted/last revised: 2008
  • Method reapproved: None
  • REF/ISBN: IP156-2934869
  • Status: Current
  • First printed in STM books: January 2008

Scope

This International Standard specifies a fluorescent indicator adsorption method for the determination of hydrocarbon types over the concentration ranges from 5 % (V/v) to 99 % (V/V) aromatic hydrocarbons, 0,3 % (V/v) to 55 % W/v) olefins, and 1 % W/v to 95 % (V/V) saturated hydrocarbons in petroleum fractions that distill below 315 °C.

This test method is for use with full boiling range products. Cooperative data have established that the precision statement does not apply to petroleum fractions with narrow boiling ranges near the 315°:C limit. Such samples are not eluted properly, and results are erratic.

Samples containing dark-coloured components thatinterfere with reading the chromatographic bands cannot be analysed.

NOTE 1 - The precision of this test method has been determined with unleaded fuels that do not contain oxygenated blending components. It may or may not apply to fuels containing lead antiknock mixtures or oxygenated blending components or both. However the oxygenated blending components methanol, ethanol, tertbutyl methyl ether (MTBE), methyl tert-pentyl ether (TAME) and tert-butyl ethyl ether (ETBE) do not interfere with the determination of hydrocarbon types at concentrations normally found in commercial petroleum blends. These oxygenated compounds are not detected since they elute with the alcohol desorbent. The effects of other oxygenated compounds should be individually verified.

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