RESONANCE ELECTRON-CAPTURE NEGATIVE-ION MASS-SPECTROMETRY FOR ANALYSIS OF PETROLEUM AND PETROLEUM-PRODUCTS - THIOPHENE S-OXIDES

Two differently processed light fractions of West Siberian petroleum w ere studied by resonance electron capture negative-ion mass spectromet ry (REC NIMS) combined with low-voltage positive-ion mass spectrometry (PIMS). It was found that benzo-and dibenzothiophene S-oxides give th e most intense signals in REC NIMS. Their concentrations did not excee d the concentrations of other impurities, but REC NIMS proved to be hi ghly sensitive to these S-oxides. It was shown that REC NIMS combined with low-voltage PIMS allow any thiophene S-oxide to be easily determi ned in petroleum.