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Pi <br /> 1 <br /> GLOSSARY TERMS <br /> Accuracy: <br /> The: nearness of a result to the true value. It is the <br /> degree of agreement of a measurement, X, (or an average of <br /> measurements of the same thing) , X, with an accepted <br /> reference or true value, T, usually expressed as the <br /> difference between the two values, X-T, or the difference as <br /> a percentage of the reference or true value, 100 (X-T)/T. <br /> Accuracy is a measure of the bias in the system. <br /> Analytical Batch: <br /> The basic unit of quality control defined as similar matrix <br /> samples which are extracted and/or analyzed together with the <br /> same method sequence and the same lots of reagents and with <br /> the manipulation common to each sample within the same time <br /> period or in continuous sequential time periods. <br /> - Audit: <br /> A systematic check to determine the quality of the laboratory <br /> operation Audits may be of two basic types: 1) Performance <br /> Audits in which quantitative data are independently obtained <br /> for comparison with known true values. 2) System Audits of <br /> a qualitative nature that consist of an on-site review of the <br /> laboratories Quality Assurance Program and physical <br /> facilities for sampling, calibration and measurement. <br /> Blanks: <br /> A blank is an artificial sample designed to monitor the <br /> introduction of artifacts into the process. For aqueous <br /> samples, reagent water is used as a blank matrix; however, a <br /> universal blank matrix does not exist for solid samples. The <br /> blank is taken through appropriate steps of the analytical <br /> process. <br /> 17 <br /> f <br />