Direkte bestemmelse av syrefordelinger i råolje og råoljefraksjoner

摘要

A method for the direct determination of the acid distribution in petroleum crude oil and crude oil fractions by chlorine negative ion chemical ionization mass spectrometry. The crude oil or crude oil fraction is introduced into a mass spectrometer followed by the introduction of a chlorinated reagent capable of producing chloride anions that can react with the acid compounds of the crude oil or crude oil fractions. The mass spectrometer is operated in negative ion mode to selectively detect negatively charged chlorinated adduct ion species. A mass spectra is obtained, from which adduct ions are selected. Peaks from resulting mass chromatograms are identified from which the acid species are quantified.