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4.2.2 Bottle Extraction Vessel . When the waste is being <br /> evaluated using the nonvolatile extraction, a jar with sufficient capacity <br /> to hold the sample and the extraction fluid is needed. Headspace is <br /> allowed in this vessel . <br /> The extraction bottles may be constructed from various materials, <br /> depending on the analytes to be analyzed and the nature of the waste (see <br /> Section 4.3.3) . It is recommended that borosilicate glass bottles be used <br /> instead of other types of glass , especially when inorganics are of <br /> concern. Plastic bottles , other than polytetrafluoroethylene, shall not <br /> be used if organics are to be investigated. Bottles are available from a <br /> number of laboratory suppliers. When this type of extraction vessel is <br /> used, the filtration device discussed in Section 4.3.2 is used for initial <br /> liquid/solid separation and final extract filtration. <br /> 4.3 Filtration Devices: It is recommended that all filtrations be <br /> performed in a hood. <br /> 4.3.1 Zero-Headspace Extractor Vessel (ZHE) : When the waste is <br /> evaluated for volatiles , the zero-headspace extraction vessel described in <br /> Section 4.2. 1 is used for filtration. The device shall be capable of <br /> supporting and keeping in place the glass fiber filter and be able to <br /> withstand the pressure needed to accomplish separation (50 psi ) . <br /> NOTE: When it is suspected that the glass fiber filter has been ruptured, <br /> an in-line glass fiber filter may be used to filter the material <br /> within the ZHE. <br /> 4.3.2 Filter Holder: When the waste is evaluated for other than <br /> volatile analytes , any filter holder capable of supporting a glass fiber <br /> filter and able to withstand the pressure needed to accomplish separation <br /> may be used. Suitable filter holders range from simple vacuum units to <br /> relatively complex systems capable of exerting pressures of up to 50 psi <br /> or more. The type of filter holder used depends on the properties of the <br /> material to be filtered (see Section 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 mm 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 positive pressure <br /> filtration. Suitable filter holders known to EPA are shown in Table 4. <br /> 4.3.3 Materials of Construction: Extraction vessels and <br /> filtration devices shall be made of inert materials which will not leach <br /> or absorb waste 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 (HDPE) , polypropylene (PP) , or polyvinyl chloride <br /> (PVC) may be used only when evaluating the mobility of metals. Borosili - <br /> CD-ROM 1311- 3 Revision 0 <br /> July 1992 <br />