This International Standard specifies a fluorescent -indicator adsorption method for the determination of hydrocarbon types over the concentration ranges from 5% )VW(to 99% )WV(aromatic ,hydrocarbons0,3% )VW(to 55% )V/V( ,olefinsand 1% )VIV(to 95% )V/v(saturated hydrocarbons in Petroleum -fractions that distill below 315 .C“Restrittions inherent in the method and the-determination of precision may limit its application as.noted