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cate glass bottles are recommended for use over other types of glass <br /> bottles, especially when inorganics are analytes 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 um, or equivalent. Filters known to EPA which meet these specifications are <br /> identified in Table 5. Pre-filters must not be used. When evaluating the <br /> mobility of metals , filters shall be acid-washed prior to use by rinsing with 1N <br /> nitric acid followed by three consecutive rinses with deionized distilled water <br /> (a minimum of 1 L per rinse is recommended) . 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®2 bags or glass , stainless <br /> steel or PTFE gas-tight syringes are used to collect the initial liquid phase and <br /> the final extract of the waste when using the ZHE device. The devices listed are <br /> recommended for use under the following conditions: <br /> 4.6. 1 If a waste contains an aqueous liquid phase or if a waste <br /> does not contain a significant amount of nonaqueous liquid (i .e. , <1% 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 /> 4.6.2 If a waste contains a significant amount of nonaqueous <br /> liquid in the initial liquid phase (i .e. , >1% of total waste) , the syringe <br /> or the TEDLAR® bag may be used for both the initial solid/liquid separation <br /> and the final extract filtration. However, analysts should use one or the <br /> other, not both. <br /> 4.6.3 If the waste contains no initial liquid phase (is 100% <br /> solid) or has no significant solid phase (is 100% liquid) , either the <br /> TEDLAR® bag or the syringe may be used. If the syringe is used, discard <br /> the first 5 mL of liquid expressed from the device. The remaining <br /> aliquots are used for analysis . <br /> 4.7 ZHE Extraction Fluid Transfer Devices: Any device capable of <br /> transferring the extraction fluid into the ZHE without changing the nature of the <br /> extraction fluid is acceptable (e.g. , a positive displacement or peristaltic <br /> pump, a gas tight syringe, pressure filtration unit (see Section 4.3.2) , or other <br /> ZHE device) . <br /> 4.8 Laboratory Balance: Any laboratory balance accurate to within <br /> + 0.01 grams may be used (all weight measurements are to be within + 0.1 grams) . <br /> 4.9 Beaker or Erlenmeyer flask, glass, 500 mL. <br /> 2 TEDLAR® is a registered trademark of Du Pont. <br /> CD-ROM 1311- 4 Revision 0 <br /> July 1992 <br />