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tIId <br /> ANALYTICAL METHODOLOGY <br /> ti <br /> Total Petroleum Hydrocarbons (TPH) Extractables by GC-FID <br /> Extraction Procedure: <br /> WATER <br /> A 1 liter sample is poured into a 2 liter separatory funnel. 3x100 ml <br /> extractions with methylene chloride (2 minute shake outs)! are, completed'.. <br /> The methylene chloride is decantedoff and concentrated to a '5 ml final <br /> volume. 'I <br /> SOIL - <br /> A 30' gram, or other appropriate aliquot of soil, is 'mixed: with 10 grams of <br /> washed sodium sulfate. 100. mis of methylene chloride is added. to the soil . <br /> and placed on a� mechanical shaker for .1 hour. The ;liquid is decanted off , <br /> and the process is repeated with an additional 50 ml of methylene chloride. <br /> The combined solvent extracts are filtered through sodium -sulfate and the <br /> extract is concentrated .to a 5 ml final volume. <br /> GC ANALYSIS - <br /> An appropriate volume of the sample --extract is injected into a Gas <br /> Chromatograph equipped with a Flame' Ionization Detector' (FID), a split/ . <br /> splitless capillary injector (operated 'ip the splitless mode), and a fused <br /> silica capillary column. .The TPH fraction is quantitated as 'gasoline and/or <br /> #2 diesel. fuel (and/or different petroleum hydrocarbon .fuel types if <br /> requested, such as .JP-4 jet .fuel) based on ,relative retention times and- <br /> examination of the elution profile. The TPH fraction quantitation is -.based <br /> on chromatographic ,peak areas against a multipoint standard curve. <br /> CHEMWEST ANALYTICAL LABORATORIES,INC. <br />