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material into an extractor bottle. Include the filter used to separate the <br /> initial liquid from the solid phase. <br /> NOTE: Sieving of the waste is not normally required. Surface area <br /> requirements are meant for filamentous (e.g. , paper, cloth) and <br /> similar waste materials. Actual measurement of surface area is not <br /> recommended. If sieving is necessary, a Teflon coated sieve should <br /> be used to avoid contamination of the sample. <br /> 7.2.11 Determine the amount of extraction fluid to add to the <br /> extractor vessel as follows: <br /> 20 x percent solids (Section 7.1 .1) x weight of waste <br /> filtered (Section 7.2.5 or 7.2.7) <br /> Weight of <br /> extraction fluid 100 <br /> Slowly add this amount of appropriate extraction fluid (see Section <br /> 7.1.4) to the extractor vessel . Close the extractor bottle tightly (it is <br /> recommended that Teflon tape be used to ensure a tight seal ) , secure in <br /> rotary agitation device, and rotate at 30 + 2 rpm for 18 + 2 hours. <br /> Ambient temperature (i .e. , temperature of room in which extraction' takes <br /> place) shall be maintained at 23 + 2 °C during the extraction period. <br /> NOTE: As agitation continues, pressure may build up within the extractor <br /> bottle for some types of wastes (e.g. , limed or calcium carbonate <br /> containing waste may evolve gases such as carbon dioxide) . To <br /> relieve excess pressure, the extractor bottle may be periodically <br /> opened (e.a. , after 15 minutes, 30 minutes, and 1 hour) and vented <br /> into a hood. <br /> 7.2. 12 Following the 18 + 2 hour extraction, separate the <br /> material in the extractor vessel into its component liquid and solid <br /> phases by filtering through a new glass fiber filter, as outlined in <br /> Section 7.2.7. For final filtration of the TCLP extract, the glass fiber <br /> filter may be changed, if necessary, to facilitate filtration. Filter(s) <br /> shall be acid-washed (see Section 4.4) if evaluating the mobility of <br /> metals. <br /> 7.2.13 Prepare the TCLP extract as follows: <br /> 7.2. 13.1 If the waste contained no initial liquid <br /> phase, the filtered liquid material obtained from Section 7.2.12 is <br /> defined as the TCLP extract. Proceed to Section 7.2.14. <br /> 7.2.13.2 If compatible (e.g. , multiple phases will not <br /> result on combination) , combine the filtered liquid resulting from <br /> Section 7.2.12 with the initial liquid phase of the waste obtained <br /> in Section 7.2.7. This combined liquid is defined as the TCLP <br /> extract. Proceed to Section 7.2.14. <br /> CD-ROM 1311- 13 Revision 0 <br /> July 1992 <br />