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<br /> <br />1 <br /> <br />LI <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />L' <br /> <br /> <br /> <br />`J <br /> <br />Gradually apply vacuum or gentle pressure of 1-10 psi, until air <br />or pressurizing gas moves through the filter. If this point is not <br />reached under 10 psi, and if no additional liquid has passed 1:h rough the <br />filter in any 2-minute interval, slowly increase the pressure in 10 psi <br />increments to a maximum of 50 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-minutes interval, <br />proceed to the next 10-psi increment. When the pressurizing ga:> begins to <br />move 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-minute <br />period), stop the filtration. <br />NOTE: Instantaneous application of high pressure can degrade the glass fiber <br />filter and may cause premature plugging. <br />7.1.1.8 The material in the filter holder is defined as <br />the solid phase of the sample, and the filtrate is defined as the <br />liquid phase. <br />NOTE: Some samples, such as oily wastes and some paint wastes, will obviously <br />contain some material that appears to be a liquid, but even after applying <br />vacuum or pressure filtration, as outlined in Step 7.1.1.7, this material <br />may not filter. If this is the case, the material within the Filtration <br />device is defined as a solid. Do not replace the original fil•:er with a <br />fresh filter 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 Step 7.1.1.3) <br />from the total weight of the filtrate-filled container. Determine <br />the weight of the solid phase of the sample by subtracting the <br />weight of the liquid phase from the weight of the total :ample, as <br />determined in Step 7.1.1.5 or 1.1.1.7. <br />Record the weight of the liquid and solid phases. <br />Calculate the percent solids as follows: <br />Percent solids = <br />Weight of solid (Step 7.1.1.9) <br />x 100 <br />Total weight of waste (Step 7.1.1.5 or 7.1.1.7) <br />1.1.2 If the percent solids determined in Step 7.1.1.9 is equal <br />to or greater than 0.5Y, then proceed either to Step 7.1.3 to determine <br />whether the solid material requires particle size reduction or to Step <br />7.1.2.1 if it is noticed that a small amount of the filtrate is entrained <br />in wetting of the filter. If the percent solids determined in Step <br />7.1.1.9 is less than 0.5%, then proceed to Step 7.2.9 if the nonvolatile <br />1312 analysis is to be performed, and to Section 7.3 with a fresh portion <br />of the waste if the volatile 1312 analysis is to be performed. <br />7.1.2.1 Remove the solid phase and filter from the <br />filtration apparatus. <br />1312 - 8 Revision 0 <br />November 1990 <br />