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r r a A{ <br /> 4.12 Vials and ca s: 2-mL for CC: auto-sampler. <br /> 4.13 GInss sc[ntillntion vials: At least 20-mL, with screw-cap and <br /> Teflon or aluminum foil lister. <br /> 4.14 S �tula: Stainless steel or Teflon. <br /> 4,15 Drvine column: 20-mm I.D. Pyrex chromatographic column with <br /> Pyrex ;lass wool at bottom and a Teflon stopcock. <br /> NOTE: Fretted glass discs Pre difficult to decontaminate after <br /> highly contaminated extracts have been passed through. Columns <br /> without frits may be purchased. Use a small pad of Pyre-,: glass <br /> wool to retain the adsorbent. Prewash the glass wool pad with <br /> 50 mL of acetone followed by 50 mL of elution solvent prior to <br /> packing the column ..Jtll adsorbent. <br /> 4.16 Syringe: 5-mL, <br /> 5.0 REAGENTS <br /> 5.1 Sodium sulfate: Anhydrous and reagent grade, heated at 4001 for <br /> 4 hr, cooled in a desicc,:tor, and stored 'n a glass bottle. <br /> Baker anhydrous powder, catalog #73898, or equivalent. <br /> 5.2 Extraction solvents: Methylene chloride:acetone (:I, v:v) , <br /> methylene chloride, hexane (pesticide quality or equivalent). <br /> 5.3 Excha:-ce solvents: Hexane, 2-propanol, cyclohexane, <br /> acetonitrile (pesticide quality or equivalent). <br /> 6,0 SAMPLE COLLECTION, PRESERVATION, AND HANDLING <br /> b.l See the introductory material to this chapter, Organic Analytes, <br /> Section 4.1. <br /> 7.0 PROCEDURE <br /> 7.1 Sample handlinn: <br /> '.1.1 Sediment/soil samples: Decant and discard any wa� er <br /> layer on a sediment sample. Mix sample thoroughly, <br /> especially composited samples, Discard any foreign <br /> objects such as sticks, leaves, and rocks, <br /> 7.1.2 Waste samples: Samples consisting of multiphases must <br /> be prepared by the phase separation method in Chapter <br /> Two before extraction. This procedure is for solids <br /> only. <br />