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rrtl_.m~l"L t'.l:Lat'G->3 • TO~KCNICR FnX ~ :-UG LB. !-:~ S~'c2PY. .'~_P.! ~ "_ Mhen liquid flow has ceased such that continued pressure filtration at 50 p;i does got result to any additional fllirate within a 2-minute oerlod, stop the filtration. i.iose the liquid inlet/outlet valve, discontinue pressure to the piston, and disconnect and weigh the filtrate coilec*.ian container. NOTE: Instantaneous application of high pressure can degrade the glass fiber filter ar.d .-ay cause prar~ature plugging. 7.3.10 The material in the ZHE is defined as the solid phase of the sample and the filtrate is defined as the liquid phase. NOTE: Some samples, such as oily wastes and some paint wastes, will obviously contain some material which appears to be a liquid. Even after applying pressure filtration, this material will not filter. If this is the case, the material within the filtration device is defined as a solid, and is carried through the 1312 extraction as a solid. If the original waste contained <0,5 :dry sclids (see Step 7.1.2), this filtrate fs defined as the 1312 extract and is analyzed directly, Proceed to Step 1.3.15. _ 7.3.11 The liquid phase may now be either analyzed immediately (see Steps 7.3.13 through 7.3.15} or stored at 4'C under minimal headspace conditions until time of analysis. Determine the weight of extraction fluid ~R3 to add to the ZHE as follows: weight of extraction fluid = 20 x ': solids (Step 7,1.1) x weight of waste filtered (Step 7.3.4 or 7.3.8} 100 7.3.12 The following steps detail how to add the appropriate amount of extraction fluid to the solid material within the ZHE and agitation cf the ZHE vessel. Extraction fluid M3 is used in all cases (see Step 5.1). 7.3.12.1 with the ZHE in the vertical position, attach a line from the extraction fluid reservoir to the liquid inlet/outlet valve. The line used shall contain fresh extraction flu td and should be preflvshed with fluid to eliminate any air packets in the line. Release gas pressure on the ZHE piston (from the gas- inletjoutlet valve), open the liquid inlet/outlet valve, and begin transferring extraction fluid (by pumping or similar means) into.. the ZHE. Continue pumping extraction fluid into the ZHE until the appropriate amount of fluid has been introduced into the device. ).3.12.2 After the extraction fluid has been added, immediately close the liquid inlet outlet valve .and disconnect the extraction fluid line. Check the ZHE to ensure that all valves are to their closed positions. Manually rotate the device in an end-over-end fashion 2 or 3 times. Reposition the ZHE in the 1312 - lfi Revision 0 November 1992 ~