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7.2.13.3 If the initial liquid phase of the waste, as <br /> obtained from Section 7.2.7, is not or may not be compatible with <br /> the filtered liquid resulting from Section 7.2.12, do not combine <br /> these liquids. Analyze these liquids, collectively defined as the <br /> TCLP extract, and combine the results mathematically, as described <br /> in Section 7.2.14. <br /> 7.2.14 Following collection of the TCLP extract, the pH of the <br /> extract should be recorded. Immediately aliquot and preserve the extract <br /> for analysis. Metals aliquots must be acidified with nitric acid to <br /> pH <2. If precipitation is observed upon addition of nitric acid to a <br /> small aliquot of the extract, then the remaining portion of the extract <br /> for metals analyses shall not be acidified and the extract shall be <br /> analyzed as soon as possible. All other aliquots must be stored under <br /> refrigeration (4 °C) until analyzed. The TCLP extract shall be prepared <br /> and analyzed according to appropriate analytical methods. TCLP extracts to <br /> be analyzed for metals shall be acid digested except in those instances <br /> where digestion causes loss of metallic analytes. If an analysis of the <br /> undigested extract shows that the concentration of any regulated metallic <br /> analyte exceeds the regulatory level , then the waste is hazardous and <br /> digestion of the extract is not necessary. However, data on undigested <br /> extracts alone cannot be used to demonstrate that the waste is not <br /> hazardous . If the individual phases are to be analyzed separately, <br /> determine the volume of the individual phases (to + 0.5%) , conduct the <br /> appropriate analyses , and combine the results mathematically by using a <br /> simple volume-weighted average: <br /> (V,) (C,) + (V2) (C2) <br /> Final Analyte Concentration = <br /> V, + V2 <br /> where: <br /> V, = The volume of the first phase W . <br /> C, = The concentration of the analyte of concern in the first phase (mg/L) . <br /> V2 = The volume of the second phase M . <br /> C2 = The concentration of the analyte of concern in the second phase <br /> (mg/L) . <br /> 7.2.15 Compare the analyte concentrations in the TCLP extract <br /> with the levels identified in the appropriate regulations . Refer to <br /> Section 8.0 for quality assurance requirements. <br /> 7.3 Procedure When Volatiles are Involved <br /> Use the ZHE device to obtain TCLP extract for analysis of volatile <br /> compounds only. Extract resulting from the use of the ZHE shall not be used to <br /> evaluate the mobility of nonvolatile analytes (e.4. , metals , pesticides, etc. ) . <br /> The ZHE device has approximately a 500 mL internal capacity. The ZHE can <br /> thus accommodate a maximum of 25 grams of solid (defined as that fraction of a <br /> CD-ROM 1311- 14 Revision 0 <br /> July 1992 <br />