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1 • <br /> s <br /> ANALYTICAL METHODOLOGY <br /> ' Ethylene Di-bromide (EDB) by Extraction and GC/ECD <br /> ' 40 ml Extraction - <br /> A weighed amount of NaCl is added to a 50 ml round bottom flask. The <br /> ' sample is poured from the 40 ml vial into the flask and swirled until the <br /> NaCl is dissolved. 2.0 m]s of QC'ed hexane is added to the sample and <br /> shaken for 2-5 minutes. Distilled water as added to the flask so the hexane <br /> layer is completely within the neck of the flask. The hexane layer is <br /> transferred into auto-sampler vials. An aliquot of the extract is in3ected <br /> into a GC equipped with an electron capture detector (ECD) and packed <br /> ' colu mn. - <br /> 1000 ml (liter) Extraction <br /> In a separatory funnel, one liter of sa mple and 10 ml of hexane are <br /> combined and shaken vigorously for ten minutes. The solvent and water <br /> phases are allowed to separate, and then the hexane layer is transferred to <br /> a screw cap vial along with a small amount of sodium sulfate. An aliquot <br /> of the extract is in3ected into a GC equipped with an electron <br /> capture detector and a packed column. <br /> 1 <br /> 1 <br /> ' CHEMWEST ANALYTICAL LABCRATORIES INC <br />