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' aRR, FRIEDMAN & BRUYA, 1* <br /> ENVIRONMENTAL CHEMISTS <br /> GASOLINE FINGERPRINT COMPARISON <br /> BY GC/SID <br /> Four peaks were selected for this comparison. The four have <br /> been tentatively identified as heptanes by retention time, <br /> but we are awaiting arrival of pure material to generate <br /> ' standards from before final assignment is made. The <br /> heptanes were chosen because of their published constancy of <br /> relative abundance ratios, along with their uniqueness to <br /> original stocks from which the product was distilled. The <br /> four peaks were chosen and compared for relative abundance <br /> by dividing the area of the chromatogram produced by each <br /> one by that produce by the first eluting heptane (A) . The <br /> ' results are tabulated below: <br /> ' Abundance Relative To A <br /> A <br /> Sample #k B D <br /> ' T-3 <br /> 3-18-88 1 . 00 1 . 61 1 . 13 1 . 01 <br /> ' T-11 <br /> 3-18-88 1 . 00 1 . 67 1 . 24 1 . 11 <br /> ' T-12 <br /> 3-18-88 1 . 00 1 . 66 1 .21 1 . 08 <br /> MO Gas <br /> ' Military Standard 1 . 00 5. 63 3 . 93 0 . 169 <br /> Ref Gas $1 1 . 00 1 . 40 0 . 725 0 .596 <br /> Time Oil Co. 1 . 00 2 . 69 1 . 97 0 , 429 <br /> 3-7-88 <br /> ' It is clear from the results listed above, that the product <br /> removed from the wells on 3-18-88 were far more like each <br /> ' other than they were like any of the controls. Furthermore, <br /> they showed less variation between each other than did the <br /> controls amongst themselves. The virtual lack of <br /> ' dissimilarity between the samples taken on 3-18-88 suggests <br /> that they are all a single gasoline, or that any mixing of <br /> multiple stocks had been thoroughly accomplished by 3-18-88 . <br />