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r,~~, ,. „ti Oi.cG. ..-,. iU~,CLh, _. r.-it ' ;-l.G '-~. _.~< S:!9CJ'I._P.!. <br />NOTE: if waste matfal (>I X of the^orlginal sample weight) has obviously -. <br />adhered to the container used to transfer the sample to the filtration <br />apparatus, determine the weight of this residue and subtract it from *.he <br />sample weight determined in Step 7.2.5, to determine the weight of the <br />waste samole that will be filtered. <br />Gradually apply vacuum or gentle pressure of 1-10 p;i, until air <br />or pressurizing gas moves through the filter, If this point if not <br />reached under 10 psi, and if no additional Tiquid has passed through the <br />filter in any 2-minute interval, slowly increase the pressure fn 10-psi <br />increments to maximum of SO psi. After each incremental increase of 10 <br />psi, if the pressurizing gas has not moved through the filter, and if no <br />additional liquid has passed through the filter in any 2-minute interval, <br />proceed to the next 10-psi increment. When the pressurizing gas begins to <br />move through the filter, or when the liquid flow has ceased at 50 psi <br />(i`e., filtration does not result in any additional filtrate within a <br />2-minute period), stop the filtration. <br />NOTE: Instantaneous application of high pressure can degrade the glass fiber <br />filter and may cause premature plugging. <br />7.2.8 The material in the filter holder is defined as the solid <br />phase of the sample, and the filtrate is defined as the liquid phase. <br />Weigh the filtrate. The liquid phase may now be either analyzed (see <br />Steps ).2.12) or stored at 4•L until time of analysis. <br />NOTE: Same wastes, such as oily wastes and some paint wastes, will obviously <br />contain some material which appears to be a liquid. Even after applying <br />vacuum or pressure filtration, as outlined in Step 1.2.7, this material <br />may not filter. [f this is the case, the material within the filtration <br />device is defined as a solid, and is carried through the extraction as a <br />solid. Uo not replace the original filter with afresh filter under any <br />circumstances. Use only one filter. <br />J.2.9 If the sample contains <0.5". dry solids (see Step 7.1.2), <br />proceed to Step 1.2.13. If the sample contains >0.5 Y. dry solids (see <br />Step 1.1.1 or 7.1.2), and if particle-size reduction of the solid was <br />needed in Step 7.1.3, proceed to Step 1.2.10. if the sample as received <br />passes a 9.5 mm sieve, quantitatively transfer the solid material into the <br />extractor bottle along with the filter used to separate the initial liquid <br />from the solid phase, and proceed to Step 7.2.11. <br />1.2.10 Prepare the solid portion of the sample for extraction by <br />crushing, cutting, or grinding the waste to a surface area or particle- <br />size as described in Step 1.1.3. When the surface area or particle-size <br />has been appropriately altered, quantitatively transfer the solid material <br />into an extractor bottle. Include the filter used to separate the initial <br />liquid from the solid phase. <br />NOTE: Sieving of the waste is not nor~ally required. Surface area requirements <br />are meant for filamentous (e.a., paper, cloth) and similar waste <br />materials. Actual measurement of surface area is not recorraended. [f <br />1312 - II P.evision 0 <br />November 1992 <br />