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ANALYTICAL METHODOLOGY <br /> ln <br /> SEX (BenZene, Toluene, Ethyl Benzene, and Xylenes) by Purge & Trap and <br /> GC-PED <br /> WATER - method 502 or $620 <br /> A 5 ml sample volume, or 5 ml of a suitable dilution, is purged an a <br /> a and trap system with helium. The purged sample i` analyzed <br /> suitable p=9ed with a Photoionization Detector (PID). <br /> on a Gas Chrorlatograph eq pQ <br /> r <br /> packed column is used to separate the compounds. <br /> fA <br /> SOFT, -- Method 8026 <br /> ` or other appropriate aliquot of soil, is weighed into a clean <br /> A 16 gram, <br /> �.- VOA vial. SO oil from each end of2-5 <br /> received in brass cortheL�tubess(this is done to�reduce gthe <br /> f centimete portion of soil that has been exposed to sampling <br /> possibility of analyzing a p <br /> of soil are <br /> technique contamination). Equal aliquots then removed from <br /> each end of the tube and combined in the VOA vial. Sod in ]mss or bags <br /> is aliquoted using a similar technique, which discards exposed sample <br /> surfaces. A 10 ml, or other appropriate volume of methanol, is added to <br /> the soil and the soil is shaken with the solvent. 100 ul a€ the extract, or <br /> 5 ml Of <br /> a reduced aliquot or volume of a suitablethe same technique usedlution, is injectedtfar water <br /> laboratory blank water and analyzed by <br /> sa mples. <br /> k <br /> CHENWEST ANALYTICAL LA90RATCRIES.INC. <br />