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solids content of the waste sample (percent solids, See Section 7.1.1) , whether <br /> the initial liquid phase of the waste will be miscible with the aqueous extract <br /> of the solid, and whether inorganics , semivolatile organics , pesticides , and <br /> herbicides are all analytes of concern. Enough solids should be generated for <br /> extraction such that the volume of TCLP extract will be sufficient to support all <br /> of the analyses required. If the amount of extract generated by a single TCLP <br /> extraction will not be sufficient to perform all of the analyses, more than one <br /> extraction may be performed and the extracts from each combined and aliquoted for <br /> analysis. <br /> 7.2. 1 If the waste will obviously yield no liquid when subjected <br /> to pressure filtration (i .e. , is 100% solid, see Section 7.1.1) , weigh out <br /> a subsample of the waste (100 gram minimum) and proceed to Section 7.2.9. <br /> 7.2.2 If the sample is liquid or multiphasic, liquid/solid <br /> separation is required. This involves the filtration device described in <br /> Section 4.3.2 and is outlined in Sections 7.2.3 to 7.2.8. <br /> 7.2.3 Pre-weigh the container that will receive the filtrate. <br /> 7.2.4 Assemble the filter holder and filter following the <br /> manufacturer's instructions. Place the filter on the support screen and <br /> secure. Acid wash the filter if evaluating the mobility of metals (see <br /> Section 4.4) . <br /> NOTE: Acid washed filters may be used for all nonvolatile extractions <br /> even when metals are not of concern. <br /> 7.2.5 Weigh out a subsample of the waste (100 gram minimum) and <br /> record the weight. If the waste contains <0.5% dry solids (Section <br /> 7.1 .2) , the liquid portion of the waste, after filtration , is defined as <br /> the TCLP extract. Therefore, enough of the sample should be filtered so <br /> that the amount of filtered liquid will support all of the analyses <br /> required of the TCLP extract. For wastes containing >0.5q dry solids <br /> (Sections 7.1.1 or 7.1.2) , use the percent solids information obtained in <br /> Section 7.1.1 to determine the optimum sample size (100 gram minimum) for <br /> filtration. Enough solids should be generated by filtration to support <br /> the analyses to be performed on the TCLP extract. <br /> 7.2.6 Allow slurries to stand to permit the solid phase to <br /> settle. Wastes that settle slowly may be centrifuged prior to filtration. <br /> Use centrifugation only as an aid to filtration. If the waste is <br /> centrifuged, the liquid should be decanted and filtered followed by <br /> filtration of the solid portion of the waste through the same filtration <br /> system. <br /> 7.2.7 Quantitatively transfer the waste sample (liquid and solid <br /> phases) to the filter holder (see Section 4.3.2) . Spread the waste sample <br /> evenly over the surface of the filter. If filtration of the waste at 4 °C <br /> reduces the amount of expressed liquid over what would be expressed at <br /> CD-ROM 1311- 11 Revision 0 <br /> July 1992 <br />