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10-28-1993 14.29 303 490 1522 ATI FT COLLINS P.02 <br />' ATI SOP 627FC <br /> O �C,f„ Revision o� Revised 03/24/92 <br /> Page 1 of 3 <br /> 8TAMARD OPERATING PROCEDURE FOR THE XXTRACTION <br /> OF PETROLBUK BYDROCARHON8 FOR M=Y8I8 BY IR <br /> 1-10 GUNXMY <br /> Total petroleum hydrocarbons are extracted from either water <br />' or soil samples, using freon, in an acidic environment. The <br /> extract is then treated with silica gel to remove the more <br /> polar animal oils and greases, yielding total petroleum <br /> hydrocarbons and analyzed by IR. This method is capable of <br />' detecting hydrocarbons in the C5 to C35+ range, with <br /> characteristically poor recovery of the more volatile <br /> hydrocarbons (especially CS to C7) because of the extensive <br /> sample manipulation and volatile loss inherent in the method. <br /> The Method Detection Limit (MDL) for water is 0. 05 mg/L; for <br />' soils it is 1.0 mg/Xg. The linear working range is o.5 to 50 <br /> ppm. <br /> 2.0 DI8CD88IOM/CQiG[E�iTA <br /> There are a few hints that should make this test run more <br /> smoothly, especially in the area of reproducibility. First, <br /> reduce exposure of the samples to air; second, samples kept <br /> cold during extraction and analysis will lose lose volatiles; <br /> and third, after weighing out soil, cap the test tube <br /> immediately. Try to homogenise all soil samples as much as <br /> possible. For water samples, pre-rinse reparatory tunnels, <br /> long atom champagne funnels (including the Na2Sog and filter <br /> paper) and volumetrics with aliquots of freon. This should <br /> eliminate any errant blank contamination. <br />' 3.0 REA ZXT8 Alia APPARATVB <br />' 3. 1 Reagents <br /> 3 . l. 1 N%SO4: Use powdered Na2SO4 kilned at 450°C for <br /> six hours. <br /> 3.1.2 Silica Gal (100 to Zoo mash) : Use analytical <br /> grade and check a froom leachate for <br /> tcontamination. <br /> 3.1.3 Freon (1,1, 2-Trichlero-11202-trif luoroethane) : <br /> HPLC grade or batter. <br /> 3.1.4 Hydrochloric Acid (1: 1) : Mix equal volumes of <br /> F concentrated hydrochloric acid (HCl) and <br /> dsionized water. <br />