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FRCM~ L cGZEd'Gr~ IY Tp:zCti (CR FYx • PLG ._. _~- _.?;1 ~'P.: . whether the initial liquid phase of the vreste will be miscible with the aqueous extract of the solid, and whether lnorgar.tcs, sami'~olatile organics, pesticides, and herbicfdes are all analyses of concern. Enough solids should be generated for extraction such that the •rolume of 1312 extract will be sufficient to support all of the analyses required. If the amount cf extract generated Sy a single 1312 extraction will not be sufficfent to perform all of the analyses, more than one extraction may be performed and the extracts from each combined and aliquoted for analysis. 7.2.I If the sample will obviously yield ne liquid when subjected to pressure filtration (i.~., is 100 Y. solid, see Step 7.1.1}, weigh out a subsample of the sample (100 gram minimum} and proceed to Step 7.2.9. 7.2.2 If the sample is liquid or multiphasic, liquid/solid separation is required. This in~ralves the filtration device described in Step 4.3.2 and is outlined in Steps 7.Z.3 to 7.2.8. 1.2.3 Pre-weigh the container that will receive the filtrate. 1.2.4 Assemble the filter holder and filter following the manufacturer's instructions. Pi ace the filter on the support screen and secure. Acid wash the filter if evaluating the mobility of metals (see Step 4.4). Note: Acid washed filters may be used for all nonvolatile extractions even when metals are not of concern. .7,2.5 Weigh out a subsample of the sample (1.00 gra:^ minimum) and racord the weight. if the waste contains <0.5 Y. dry solids (Step 7.1.2), the liquid portion of the waste, after filtration, is defined as the 1312 extract. Therefore, enough of the sample shculd be filtered so that the ameunt of filtered liquid will support all of the analyses required of the 1312 extract. Fcr wastes containing >0.5 :dry solids (Steps 1.1.1 or 7.1.2), use the percent solids {nformaticn obtained in Step 7.1.1 to determine the optimum sample size (lOG gran minimum) for filtration. Enough solids should be generated by filtration to support the analyses to be performed on the 1312 extract. 1.2.6 Allow slurries to stand to permit the solid phase to settle. Samples that settle slowly may be centrifuged prior to filtration. Use centrifugation only as an aid to filtration. If the sample is centrifuged, the liquid should be decanted and filtered followed by filtration of the solid portion of the waste through the same filtration system. 7.2.7 Quantitatively transfar the sample (liquid and solid phases) to the filter holder (see Step 4.3.2}. Spread the waste sample evenly over the surface of the filter. If filtration of the waste at 4'C reduces the amount of expressed liquid over what would be expressed at room temperature, then allow the sample to warm up to room temperature in the device before filtering. .\ 1112 - 10 Revision 0 November 1942