was bubbled into srd and followed by extraction processes a significant improvement was observed in the removal of total sulfur content ozone bubbling was performed in 120 ml of srd for 15 30 60 90 and 120 minutes in tightly closed glass vial of 500 ml at o 2 flow rate of 1000 ml minute with ozone output of 36 u03bcg ml i e 36 u03bcg of ozone in 1 ml of o 2 then the polar sulfur compounds in the ozonized srd samples were extracted using acetonitrile and dmf see the results in table 2 and fig3 in case of extraction using acn by 1 2 v v volume of srd volume of solvent in one time the total sulfur removal was reported as 20 0 30 7 45 7 55 18 and 62 43 extraction with the same ratio for two times the removal was 30 42 18 65 7 63 3 81 16 under bubbling of ozone for a time of 0 15 30 60 and 90 minutes respectively moreover in case of extraction using dmf with the same ratio one time the removal of total sulfur was 51 1 64 76 02 84 62 and 86 56 two times the removal was 60 2 84 04 87 9 90 0 and 94 0 under bubbling of ozone for a time of 0 15 30 60 and 90 minutes respectively it was found that dmf has better extractability of sulfur compounds from srd than acn the maximum desulfurization reached 93 86 and 81 16 in case of use of extraction of sulfur compounds.