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NOTE: 11hen it is • petted Chat the glass fiber filter has been ruptured, an `.• <br />in-line glass fiber filter may be used to filter the material within the <br />ZHE. <br />4.3.2 FilLr 1?o-l~e^• ,~~'_n the Sd~TNl2 75 c'ldi,ldtcu' fti( Uthcf Cilan <br />volatile analytas, a filolder capable of supporting a glass fiber <br />filter and able to withsta e pressure needed to accomplish seYaration <br />may be used. Suitable filter holders range from simple vacuum units to <br />relatively complex system, capa~fle of exerting pressures of up to 50 psi <br />or more. The type of filter holder used depends on the properties cf the <br />material to be filtered (see Step 4.3.3). These devices shall have a <br />minimum internal volume of 300 mL and be equipped to accommodate a minimum <br />filter size of 47 mm (filter holders having an internal capacity of 1.5 L <br />or greater, and equipped to accommodate a 142 mr: diameter filter, are <br />recommended). Vacuum filtration can only be used for wastes with low <br />solids content (<10 ;) and for highly granular, liquid-containing wastes. <br />All other types of wastes should be filtered using pasiti~re pressure <br />filtration. Suitable filter holders known to EPA are shown in Table 4. <br />4.3.3 Ptaterials of Construction: Extraction vessels and <br />filtration devices shall be made of inert materials which will not leach <br />or absorb sample components. Glass, polytetrafluoroethylene (PTFE), or <br />type 316 stainless steel equipment may be used When evaluating the <br />mobility of both organic and inorganic components. Devices made of high- <br />density polyethylene (HOPE}, polypropylene (PP), or polyvinyl chloride <br />(PVC) may be used only when evaluating the mobility of metals. <br />8orosilicate glass bottles are recommended for use over other types of <br />glass bottles, especially when inorganics are analyt>; of concern. <br />4.4 Filters: Filters shall be made of borosilicate glass fiber, shall <br />contain no binder materials, and shall have an effective pore size of 0.6 to <br />0.8-gym or equivalent. Filters known to EPA which meet these specffications are <br />identified in Table 5. Pre-filters must not be used. tihen evaluating the <br />mobility cf metals, filters shall be acid-wash=_d prior to use by rinsing with IN <br />nitric acid followed by three consecutive rinses with deienizpd distilled water <br />(a m;nir..um of I-L per rinse is reco~nended). Glass fiber filters are fragile and <br />should be handled with care. <br />4.5 pH Meters: The meter should be accurate to + 0.05 units at 25'C. <br />4.6 ZHE Extract Collection Devices: TEDLAR°Z bags or glass, stainless <br />steel or PTFE gas-tight syringes are used to collect the initial liquid phase and <br />the final extract when using the ZHE device. These devices listed are <br />recommended for use under the following conditions: <br />4.6.] !f a waste ccntains an aqueous liquid phase or if a waste <br />does not contain a signi~icant amount of nonaqueous liquid (i_e., <2 : of <br />total waste), the TEDLAR bag or a 600 mL syringe should be used to collect <br />and combine the initial liquid and solid extract. <br />zTEDLAR° is a registered trademark•of Du Pont. <br />13t2 - 3 Revision 0 <br />November 1992 <br />