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J <br /> ANALYTICAL METHODOLOGY <br /> Total Petroleum Hydrocarbons (TPH) Extractables by GC-FID <br /> Extraction Procedure: ! <br /> WATER - Luft Field Manual p <br /> M A ; <br /> A 1 liter sample is poured into a 2 liter separator'y funnel. 3x100 ml extractions <br /> with methylene chloride (2 minute shake outs) are �completed. The methylene chloride <br /> is decanted off and concentrated to a 5 ml final Tlu m e. <br /> SOIL - Luft Field Manual f <br /> I <br /> A 30 gram, or other appropriate aliquot of soil, is mixed with 10 grams of washed <br /> sodium sulfate. 100 mis of methylene chloride is added to the soil and placed on a <br /> mechanical shaker for 1 hour. The liquid is decanted off and the process is repeated <br /> w' S ml of methylene chloride. The combined solvent extracts are <br /> with an additional 0 <br /> Y <br /> filtered through sodium sulfate and the extract is ,concentrated to a 5 ml final <br />'t volume. <br /> - �Is <br /> GC ANALYSIS - <br /> An appropriate volume of the sample extract is injected into a Gas Chromatograph <br /> equipped with a Flame onization Detector (FID), a split/ splitless capillary injector <br /> (operated in the splitless mode), and a fused silica' capillary column. The TPH <br /> fraction is quantitated as gasoline and/or #2 diesel fuell (and/or different petroleum <br /> hydrocarbon fuel types 2' requested, such as JP-4 ;jet fciel) based on relative <br /> retention times and examination of the elution profile. IThe TPH fraction <br /> ea <br /> quantitation is based on chromatographic peak ar <br /> s against a multipoint standard <br /> curve. <br /> i <br /> CHEMWESf ANALYTICAL LABORATORIES,INC. ; <br /> ii <br /> i i� <br />