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e <br /> AWJXnCAL CCUD'iTICNS <br /> Gas chromatographic analysis is performed uame a z MAC <br /> 5so oras Chia�aph euipp� with a flame ionization <br /> detector and 10% SP 2100 on �ck column <br /> (6' x <br /> Heated zoo have the follawing tempemtur� : <br /> Tnjector 2000C <br /> Detector 25000 <br /> Column wen 15000 <br /> Data accjt�ition is done by a PC using Kelson Analytical. <br /> 00matography Software. <br /> The flame ionization detector is calibrated daily in the <br /> �;es of gasoline vapor- . gasoline <br /> Field with 3k..,r,x,.d� 4uan by injecting 10 ul of PUM <br /> vapor stares prepared l ,�, bulb filled with nitrogen. <br /> gasoline into 0.5L Supel g analyzing <br /> �e linearity of detector response is verified mon using <br /> gasoline standard at the levels <br /> „+,.,��,�r-t= terhr►icue (7cc <br /> variable injection size sample <br /> 0.500, 0.250--) . <br /> considered aaeptable if relative <br /> The calibration line is <br /> sta� deviation of the three response factors is < 10%. <br /> In the of sample analysis calibration dlecks are <br /> frequently performed to firm its stability and val.idi.ty. <br /> � eon <br /> � of nitrogAn Prays that the systems are clean and <br /> no carryover takes place. <br /> Soil vapor samples are directly injected cn 'the column in <br /> i the same fashion as gasoline standards, using lcc gas tight <br /> dilutions are required due to <br /> syringe. In cases where <br /> detector we=w)ge, smaller injection sizes are used during <br /> repeated analysis. <br /> is also analyzed to establish methene <br /> retention time which allows to make corrections for methane <br /> widen it, is present in soil vapor and achieve better accuracy <br /> insreporting gasoline vapor Content. <br /> FN ViPON MFNftI <br /> LA844110 91FS. INC <br />