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0 <br />0 <br />0 <br />0 <br />C <br />i <br />i <br />C <br />0 <br />Project Plan <br />Revision 6 <br />1/8/1988 <br />Page 12 of 37 <br />5.0 ANALYTICAL PERFORMANCE - CONTROL AND EVALUATION <br />Analytical data is verified by a variety of performance samples and <br />techniques. In this way, precision and accuracy of the various methods are <br />measured and compared with predetermined criteria for acceptable <br />performance. <br />Precision means the measurement of a set of replicate results among <br />themselves without assumption of any prior information as to the true <br />result. Precision is assessed,by means of duplicate/replicate sample <br />analysis. <br />Accuracy means the nearness of a result or the mean (x) of a set of <br />results to the true value. Accuracy is assessed by means of reference <br />samples and percent <br />- precision and accuracy of the analysis, <br />In the evaluation of <br />must be taken to compare measurements on the same basis. Precision and <br />accuracy may be measured for successive analyses by the person, the same <br />standard on different days, the same spike in different matrices, the same <br />sample by different laboratories, and many combinations of the above. In <br />the implementation of the following control techniques, effort is made to <br />take these situations into account. <br />5.1 Analytical Procedures <br />ELI QA/QC Procedures are used to assure the analytical procedures are <br />performed well under normal laboratory conditions. An analytical procedure <br />includes three main steps: A) Standard preparation, B) Instrument <br />calibration and C) Sample preparation and analysis. Errors occuring in any <br />step will cause a biased result. Therefore, specific QA/QC procedures are <br />18 <br />