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'11 al <br /> M. <br /> Oh <br /> Tracer Research Corporal:an <br /> s� <br /> cad <br /> A gas chromatograph equipped with a flame ionization <br /> detector, was used for analyses of benzene, toluene, <br /> "r^ ethylbenzene, xylenes, and total hydrocarbons. xylenes are <br /> i <br /> ^� reported as the total of the three isomers and total hydrocarbons <br /> are C4-C9 aliphatic, aromatic and alicyclic compounds. <br /> Detection limits are a function of the injection volume as <br /> � �. well as the detector -sensitivity for individual compounds. Thus, <br /> the detection limit varies with the sample size. Generally, the <br /> larger the injection size the greaterthe sensitivity. However, <br /> compounds or <br /> peaks p f pounds of interest mustbe kept within the linear r. _ <br /> range of the detector. If any compound has a high concentration, '• , <br /> it is necessary to use small injections, and in some cases .to <br /> dilute the. sample to keep it 'within linear range. This may cause <br /> . � decreased detection limits for other compounds in the analyses. <br /> The detection limits range down to 0.05 yg/L for compounds such <br /> k as benzene depending an the conditions of the measurement,. in <br /> particular, the sample size. If any.'component being analyzed is <br /> IL <br /> I <br /> not detected, the detection limit for that w compound in that <br /> 14p <br /> iv is <br /> analysis.anal <br /> j y given as a less than value '(e.g. <0.1 µg/L) . This <br /> number is calculated from the current response factor, the sample <br /> sizes and the estimated�txmated mini !usrt peak size ;(area) that would have <br /> been visible underthe conditions of the .measurement. <br /> r <br /> J J"; <br /> v <br /> xi <br /> € <br /> i <br />