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Attach a gas line to the gas inlet/outlet valve (bottom flange) <br />and, with the liquid inlet/outlet valve (top flange) open, begin applying <br />gentle pressure of 1-10 psi (or mare if necessary) to force all headspace <br />slowly out of the ZNE device into a hood. At the first appearance of <br />' liquid from the liquid inlet/outlet valve, quickly close the valve and <br />discontinue pressure. If filtration of the waste at 4•C r~aduces the <br />amount of expressed liquid over what would be expressed at room <br />' temperature, then allow the sample to warm up to room temperature in the <br />device before filtering. If the waste is 100 percent solid (see Step <br />7.1.1), slowly increase the pressure to a maximum of 50 psi to force most <br />of the headspace out of the device and proceed to Step 1.3.12. <br />' 7.3.9 Attach the evacuated pre-weighed filtrate ~:ollection <br />container to the liquid inlet/outlet valve and open the valve. Begin <br />applying gentle pressure of 1-10 psi to force the liquid phase of the <br />sample into the filtrate collection container. If no additional liquid <br />has passed through the filter in any 2-minute interval, slowl~~ increase <br />' the pressure in 10-psi increments to a maximum of 50 psi. F,fter each <br />incremental increase of 10 psi, if no additional liquid has pass~ad through <br />the filter in any 2-minute interval, proceed to the next 10-psi increment. <br />When liquid flow has ceased such that continued pressure filtration at 50 <br />psi does not result in any additional filtrate within a 2-minute period, <br />stop the filtration. Close the liquid inlet/outlet valve, discontinue <br />pressure to the piston, and disconnect and weigh the filtrate collection <br />' container. <br />NOTE: Instantaneous application of high pressure can degrade the glass fiber <br />' filter and may cause premature plugging. <br />7.3.10 :The material in the ZHE is defined as the solid phase of <br />' the sample and the filtrate is defined as the liquid phase. <br />NOTE: Some samples, such as oily wastes and some paint wastes, will obviously <br />contain some material which appears to be a liquid. Even after applying <br />pressure filtration, this material will not filter. If this is the case, <br />the material within the filtration device is defined as a solid, and is <br />carried through the 1312 extraction as a solid. <br />' If the original waste contained <0.5 percent dry solids (see Step <br />7.1.2), this filtrate is defined as the 1312 extract and is analyzed <br />' directly. Proceed to Step 1.3.15: <br />7.3.11 The liquid phase may now be either analyzed immediately <br />t (see Steps 7.3.13 through 1.3.15) or stored at 4•C under minimal headspace <br />conditions until time of analysis. Determine the weight of extraction <br />fluid ~3 to add to the ZHE as follows: <br />1 20 x ~ solids (Step 7.1.1) x weight <br />of waste filtered (Step 1.3.4 or 7.3.8) <br />' Weight of extraction fluid = <br />100 <br />1 <br />1312 - 16 <br />Revision 0 <br />November 1990 <br />