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ABSTRACT
The IP391/95 method using high performance liquid chromatography (HPLC) with refractive index detection, has been utilized to determine hydrocarbons group type (saturates, monoaromatics, diaromatics and polyaromatics) in middle distillates. A modification to this method is proposed involving the use of hydrocarbon group type concentrates separated using liquid chromatography as standards in place of single compound and use of area % and response ratio in lieu of area, slope and intercept has been investigated. The results from the above two approaches are compared with standard IP391/95 as well as with the gas oil of known composition prepared by mixing hydrocarbon concentrates. The results from above comparison suggested that the data derived using hydrocarbon group type concentrates was reliable. Appreciable difference was not observed in data derived using area percent response ratio and area slope intercept. The former method was suggested for regular use, as repeatability of area percent was better than the data based on area. The data generated by both the original and modified procedure for a set of five gas oil samples obtained from different sources have been compared and a difference of 0.5-6.5% w/w in saturates. 1.0-3.2% w/w in
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