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1 <br />7.1.2.2 Dry the filter and solid phase at l00 ± 20•C <br />r until two successive weighings yield the same value within ± 1 <br />percent. Record the final weight. <br /> <br />1 <br />Note: Caution should be taken to ensure that the subject solid will not flash <br />upon heating. It is recommended that the drying oven be ventecl to a hood <br />or other appropriate device. <br />' Percent <br />dry solids = <br />1 <br />7.1.2.3 Calculate the percent dry solids as follows: <br />(Weight of dry sample + filter) - tared weight of filter <br />_ x 100 <br />Initial weight of sample (Step 7.1.1.5 or 7.1.1.7) <br />7.1.2.4 If the percent dry solids is less than 0.5~, <br />then proceed to Step 7.2.9 if the nonvolatile 1312 analysis is to <br />be performed, and to Step 1.3 if the volatile 1312 analysis is to <br />' be performed. If the percent dry solids is greater than or equal <br />to 0.5%, and if the nonvolatile 1312 analysis is to be performed, <br />return to the beginning of this Section (1.1) and, with a fresh <br />' portion of sample, determine whether particle size reduction is <br />necessary (Step 7.1.3). <br />1 <br />1 <br /> <br />1 <br /> <br />1 <br />1 <br /> <br /> <br />7.1.3 Determination of whether the sample requires particle-size <br />reduction (particle-size is reduced during this step): Using the solid <br />portion of the sample, evaluate the solid for particle size. Particle- <br />size reduction is required, unless the sol i has a surface area per gram <br />of material equal to or greater than 3.1 cm , or is smaller than 1 cm in <br />its narrowest dimension (i_e., is capable of passing through a 9.5 mm <br />(0.375 inch) standard sieve). If the surface area is smaller or the <br />particle size larger than described above, prepare the solid portion of <br />the sample for extraction by crushing, cutting, or grinding the waste to <br />a surface area or particle size as described above. If the solids are <br />prepared for organic volatiles extraction, special precautions must be <br />taken (see Step 7.3.6). <br />Note: Surface area criteria are meant for filamentous ( a paper, cloth, and <br />similar) waste materials. Actual measurement of surface area is not <br />required, nor is it recommended. For materials that do not obviously meet <br />the criteria, sample-specific methods would need to be devf~loped and <br />employed to measure the surface area. Such methodology is currently not <br />available. <br />7.1.4 Determination of appropriate extraction fluid: <br />7.1.4.1 For soils, if the sample is from a site that is <br />east of the Mississippi River, extraction fluid #1 should be used. <br />If the sample is from a site that is west of the Mississippi River, <br />extraction fluid q2 should be used. <br />1312 - 9 Revision 0 <br />November 1990 <br />