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' 7.1.4.2 For wastes and wastewater, extraction fluid #1 <br />should be used. <br />' 7.1.4.3 For cyanide-containing wastes and/or soils, <br />extraction fluid N3 (reagent water) must be used because leaching <br />of cyanide- containing samples under acidic conditions may result <br />in the formation of hydrogen cyanide gas. <br />' 7.1.5 If the aliquot of the sample used for the preliminary <br />evaluation (Steps 7.1.1 - 7.1.4) was determined to be 1009'° solid at Step <br />7.1.1.1, then it can be used for the Section 7.2 extraction (~issuming at <br />least 100 grams remain), and the Section 7.3 extraction (assuming at least <br />25 grams remain). If the aliquot was subjected to the procedure in Step <br />7.1.1.7, then another aliquot shall be used for the volatile extraction <br />procedure in Section 7.3. The aliquot of the waste subjected to the <br />procedure in Step 7.1.1.7 might be appropriate for use for the :section 7.2 <br />extraction if an adequate amount of solid (as determined by Step 7.1.1.9) <br />was obtained. The amount of solid necessary is dependent upon whether a <br />sufficient amount of extract will be produced to support the arrilyses. If <br />an adequate amount of solid remains, proceed to Step 7.2.10 of the <br />' nonvolatile 1312 extraction. <br />7.2 Procedure when Volatiles are not Involved <br />' A minimum sample size of 100 grams (solid and liquid phases) is <br />recommended. In some cases, a larger sample size may be appropriate, depending <br />on the solids content of the waste sample (percent solids, See Strap 7.1.1), <br />' whether the initial liquid phase of the waste will be miscible with the aqueous <br />extract of the solid, and whether inorganics, semivolatile organics, pesticides, <br />and herbicides are all analytes of concern. Enough solids should be generated <br />' for extraction such that the volume of 1312 extract will be sufficient to support <br />all of the analyses required. If the amount of extract generated b;V a single <br />1312 extraction will not be sufficient to perform all of the analyses, more than <br />' one extraction may be performed and the extracts from each combined and aliquoted <br />for analysis. <br />' 7.2.1 If the sample will obviously yield no liquid when subjected <br />to pressure filtration (i.e., is 100 percent solid, see Step 7.1.1), weigh <br />out a subsample of the sample (100 gram minimum) and proceed to Step <br />7.2.9. <br />7.2.2 If the sample is liquid or multiphasic, li~luid/solid <br />separation is required. This involves the filtration device described in <br />' Step 4.3.2 and is outlined in Steps 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 foll~~wing the <br />manufacturer's instructions. Place the filter on the support ~;creen and <br />secure. Acid wash the filter if evaluating the mobility of metals (see <br />Step 4.4). <br />Note: Acid washed filters may be used for all nonvolatile extractions even when <br />' metals are not of concern. <br />-. 1312 - 10 Revision 0 <br />t November 1990 <br />