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For final filtration of the 1312 extract, the glass fiber fili;er may be <br />I ~; changed, if necessary, to facilitate filtration. Filter(s) shall be <br />acid-washed (see Step 4.4) if evaluating the mobility of metals. <br />7.2.13 Prepare the 1312 extract as follows: <br />7.2.13.1 If the sample contained no initial liquid phase, <br />' the filtered liquid material obtained from Step 7.2.12 is defined <br />as the 1312 extract. Proceed to Step 7.2.14. <br />' 7.2.13.2 If compatible (e•o•, multiple phases. will not <br />result on combination), combine the filtered liquid resulting from <br />Step 1.2.12 with the initial liquid phase of the sample obtained <br />' in Step 7.2.7. This combined liquid is defined as the 1312 <br />extract. Proceed to Step 1.2.14. <br />7.2.13.3 If the initial liquid phase of the waste, as <br />' obtained from Step 7.2.1, is not or may not be compatible with the <br />filtered liquid resulting from Step 7.2.12, do not combine these <br />liquids. Analyze these liquids, collectively defined as the 1312 <br /> extract, and combine the results mathematically, as de:>cribed in <br /> Step 7.2.14. <br />' 7.2.14 following collection of the 1312 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 pH < . <br />" ~ 2. If precipitation is observed upon addition of nitric acid to a small <br />.') aliquot of the extract, then the remaining portion of the e;ctract for <br /> metals analyses shall not be acidified and the extract shall be analyzed <br /> as soon as possible. All other aliquots must be stored under <br /> refrigeration (4•C) until analyzed. The 1312 extract shall be prepared <br />' and analyzed according to appropriate analytical methods. 1312 extracts <br /> to 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 haz~~rdous 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 percent), conduct <br />' the appropriate analyses, and combine the results mathematically by using <br /> a simple volume-weighted average: <br /> (V~) (C~) + (Vz) (Cz) <br />' Final Analyte Concentration = <br /> V~ + Vz <br /> where: <br /> V~ The volume of the first phase (L). <br />' C~ = The concentration of the analyte of concern in the first phase (mg/L). <br /> Vz = The volume of the second phase (L). <br /> <br />, CZ = The concentration of the analyte of concern in the second phase <br /> <br />' (mg/L). <br /> 1312 - 13 Revision 0 <br />' November 1990 <br />