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NOTE: If waste material (>1% of original sample weight) has obviously <br /> adhered to the container used to transfer the sample to the <br /> filtration apparatus , determine the weight of this residue and <br /> subtract it from the sample weight determined in Section 7.1 .1.5 to <br /> determine the weight of the waste sample that will be filtered. <br /> Gradually apply vacuum or gentle pressure of 1-10 psi , <br /> until air or pressurizing gas moves through the filter. If this <br /> point is not reached under 10 psi , and if no additional liquid has <br /> passed through the filter in any 2 minute interval , slowly increase <br /> the pressure in 10 psi increments to a maximum of 50 psi . After <br /> each incremental increase of 10 psi , if the pressurizing gas has <br /> not moved through the filter, and if no additional liquid has <br /> passed through the filter in any 2 minute interval , proceed to the <br /> next 10 psi increment. When the pressurizing gas begins to move <br /> through the filter, or when liquid flow has ceased at 50 psi (i .e. , <br /> filtration does not result in any additional filtrate within any 2 <br /> minute period) , stop the filtration. <br /> NOTE: Instantaneous application of high pressure can degrade the glass <br /> fiber filter and may cause premature plugging. <br /> 7. 1 . 1 .8 The material in the filter holder is defined as <br /> the solid phase of the waste, and the filtrate is defined as the <br /> liquid phase. <br /> NOTE: Some wastes , such as oily wastes and some paint wastes, will <br /> obviously contain some material that appears to be a liquid. Even <br /> after applying vacuum or pressure filtration, as outlined in <br /> Section 7.1 .1 .7, this material may not filter. If this is the <br /> case, the material within the filtration device is defined as a <br /> solid. Do not replace the original filter with a fresh filter <br /> under any circumstances. Use only one filter. <br /> 7. 1 .1.9 Determine the weight of the liquid phase by <br /> subtracting the weight of the filtrate container (see Section <br /> 7. 1.1.3) from the total weight of the filtrate-filled container. <br /> Determine the weight of the solid phase of the waste sample by <br /> subtracting the weight of the liquid phase from the weight of the <br /> total waste sample, as determined in Section 7.1 .1 .5 or 7.1. 1.7. <br /> Record the weight of the liquid and solid phases. <br /> Calculate the percent solids as follows: <br /> Weight of solid (Section 7.1 .1 .9) <br /> Percent solids = x 100 <br /> Total weight of waste (Section 7.1 . 1 .5 or 7 . 1 . 1 .7) <br /> 7. 1.2 If the percent solids determined in Section 7.1.1.9 is <br /> equal to or greater than 0.5%, then proceed either to Section 7. 1 .3 to <br /> CD-ROM 1311- 8 Revision 0 <br /> July 1992 <br />