Laserfiche WebLink
1 <br /> 1 <br /> ANALYTICAL METHODOLOGY <br /> BTEX (Benzene, Toluene, Ethyl Benzene, and Xylenes) by Purge & Trap and <br /> ' GC-PID <br /> ' WATER - Method 602 or 8020 <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 Photoionization Detector (PID) A fused silica megabore column is <br /> used to separate the compounds <br /> ' SOIL - Method 8020 <br /> -k 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 to the VOA vial Soil <br /> in }ars 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 /> analvzed by the same technique used for water samples <br /> 1 <br /> 1 <br />