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FRGM: IML eG2E."'•FN • LT kLh[C~ FqX • =UG I_• SSSs 9:21PM ~ . P+;1 <br />where: <br />Vi - The volume of the first phases (L}. <br />C~ The concentration of the analyte of concern in the first phase (~:g;L}, <br />Vz - The volume of the second phase (t). <br />C2 - The concentration of the analyte of concern in the second phase <br />(mgfL). <br />7.3.16 Compare the analyte concentrations in the 1312 extract with <br />the levels identified in the appropriate regulations. Refer to Section <br />8.0 for quality assurance requirements. <br />8.0 QUALITY CONTROL <br />8.1 A minimum of one blank (using the same extraction fluid as used for <br />the samples) for every 20 extractions that have been conducted in an extraction <br />vessel.. <br />8.2 A matrix spike shall be performed far each waste type (e•g•, <br />wastewater treatment sludge, contaminated soil, etc.) unless the result exceeds <br />the regulatory level and the data is being used solely to demonstrate that the <br />waste property exceeds the regulatory level. A minimum of one matrix spike must <br />be analyzed for each analytical batch. As a minimum, follow the matrix spike <br />addition guidance provided in each analytical method. <br />8.2.1 Matrix spikes are to be added after filtration of the 1312 <br />extract and before preservation. Matrix spikes should not be added prior <br />to 1312. extract ion of the sample. <br />-8.2.2 In most cases, matrix spike levels should be added at a <br />concentration equivalent to the corresponding regulatory level. Ff the <br />analyte concentration is less than one half the regulatory level, the <br />spike concentration may be as low as one half of the analyte <br />concentration, but may not be less than five times the method detection <br />limit. In order to avoid differences in matrix effects, the matrix spikes <br />must be added to the same nominal volume of 1312 extract as that which was <br />analyzed for the unspiked sample. <br />8.2.3 The purpose of the matrix spike is to monitor the <br />performance of the analytical methods used, and to determine whether <br />matrix interferences exist. Use of other internal calibration methods, <br />modification of the analytical methods, or use of alternate analytical <br />methods may be needed to accurately measure the analyte concentration in <br />the 1312 extract when the recovery of the matrix spike is below the <br />expected analytical method performance. <br />8.2.4 Matrix spike recoveries are calculated by the following <br />formula: <br />xR (~. Recovery) = 100 (Xs - X~J / K <br />where: <br />X, ~ measured value for the spiked sample <br />X~ - measured value for the unspiked sample, and <br />K • known value of the spike in the sample. <br /> <br />1312 - 13 Revision 0 <br />November 1992 ~ <br />