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Halogenated Volatile organics • Purge & Trap and GC-ELCI <br />A 5 ml sample volume is purged on a suitable purge and trap system with <br />helium. The purged sample is analyzed on a Gas Chromatograph equipped <br />with an Electrolytic Conductivity (Hall) Detector (ELCD). Either an SPJOOO <br />on Carbopack B packed column, or a DB -624 fused silica megabore column, <br />is used to separate the compounds. <br />a 19 WTAWI ITMO 1 P WIFI <br />A 10 gram, or other appropriate aliquot of soil, is weighed into a clean <br />VOA vial. Soils received in brass core tubes are sampled by discarding 2-5 <br />centimeters of soil from each end of the tubes (this is done to reduce the <br />possibility of analyzing a portion of soil that has been exposed to sampling <br />technique contamination). Equal aliquots of soil are then removed from <br />each end of the tube and combined in the VOA vial. Soil in jars 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 of the extract, or <br />a reduced aliquot or volume of a suitable dilution, is injected into 5 mi of <br />laboratory blank water and analyzed by the same technique used for water <br />samples. <br />f'UCRMAIMcT ArWVrI(-AI I ADnOATnf>IrC IN(- <br />