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ANALYTICAL METHODOLOGY <br />11 <br />ITotal Petroleum Hydrocarbons by Purge & Trap and GC -FID <br />WATER - DHS Method - Luft Field Manual <br />A 5 ml sample volume, or 5 ml of a suitable dilution, is purged on a suitable purge <br />and trap system with helium. The purged sample is analyzed on a Gas Chromatograph <br />equipped with a Flame Ionization Detector (FID). A packed column is used to <br />separate the compounds. <br />ISOIL - DHS Method - Luft Field Manual <br />A 10 gram, or other appropriate aliquot of soil, is weighed into a clean VOA vial. <br />Soils received in brass core tubes are sampled by discarding 2-5 centimeters of soil <br />from each end of the tubes (this is done to reduce the possibility of analyzing a portion <br />of soil that has been exposed to sampling technique contamination). Equal aliquots of <br />soil are then removed from each end of the tube and combined in the VOA vial. Soil <br />in jars or bags is aliquoted using a similar technique, which discards exposed sample <br />surfaces. A 10 ml, or other appropriate volume of methanol, is added to the soil and <br />the soil is shaken with the solvent. 100 ul of the extract, or a reduced aliquot or <br />volume of a suitable dilution, is injected into 5 ml of laboratory blank water and <br />analyzed by the same technique used for water samples. <br />l7 <br />I <br />rCOMPUCHEM WESTERN DIVISION <br />