ALKYLNAPHTHALENES IN KEROSENE FRACTIONS FROM INDIAN CRUDES - DERIVATIVE ULTRAVIOLET-ABSORPTION SPECTROSCOPY

Normal and second derivative ultraviolet absorption spectra of the ker osene fractions of some Indian crudes have been studied with a view to exploit derivative signals observed in the fine structure region of a lkylnaphthalenes for their quantitative analysis. It has been shown th at the second order differentiation of the normal UV-spectra provides profiles of resolved and enhanced bilobal signals at characteristic wa velengths whose magnitudes are proportional to C10, C11, C12 und C13 a lkylnaphthalene contents normally found in kerosenes. These signals we re thus utilised for the estimation of the components concerned. The v alue of the total contents of alkylnaphthalenes, thus obtained in all the fractions studied were in close agreement with these data which we re calculated using reference ASTM method D-1840.