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____... ~,. ..~. .~,. ~-,-.. ~ ,-~.u -~. 15:3 S: F1`1- rte. <br />• <br />for analysts. Metals aliquots must be. acidified with nitric acid to pH < <br />2. !f precipitation is observed upon addition of nitric acid to a small <br />aliquot of the extract, thzn the remaining portion of the extract for <br />metals analyses shall not be acidified and the extract shall be analyzed <br />as soon as passible. 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 hazardous and <br />digestion of the extract Ss 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 7.), conduct the <br />appropriate analyses, and combine the results mathematically by using a <br />simple volume-weighted average: <br />Final Analyte Concentratfon <br />where: <br />Ur + Vz <br />Vr = The volume of the first phase (L). <br />C~ ~ The concentration of the analyte of concern in the first phase (mgJL). <br />Vz = The volume of the second phase (L). <br />Cz - The concentration of the analyte of concern in the second phase <br />(mgJL). <br />7.2.]5 Compare the analyte concentrations Sn the 1312 extract with <br />the levels identified in the appropriate regulations. Refer to Section <br />2.0 for quality assurance requirements. <br />7.3 Procedure when Volatiles are involved <br />Use the Z1iE device to obtain 1312 extract for analysfs of volatile <br />compounds only. Extract resulting from the use of the ZHE shall not be used to <br />evaluate the mobility of non-volatile analytes (e.y•, 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 />sample from which no additional liquid may be forced out by an applied pressure <br />of 50 psi), due to the need to add an amount of extraction fluid equal to 20 <br />times the weight of the solid phase. <br />Charge the ZHE xith sample only once and do not open [he device until the <br />final extract (of the solid) has been collected. Repeated filling of the ZHE to <br />obtain 25 grams of solid is not permitte6. <br />Do not allow the sample, the initial liquid phase, or the extract to be <br />exposed to the atmosphere for any more time than is absolutely necessary. Any <br /> <br />1312 - 13 Revision 0 <br />November 1992 <br />