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0 <br /> where: <br /> x = the arithmetic mean of the x; measurements, and S = <br /> variance; and the relative percent difference (RPD) when <br /> only two samples are available. <br /> RPD = 100 [(xl - x2)/((xl + x2)/2)] . <br /> PROJECT: Single or multiple data collection activities that are <br /> related through the same planning sequence. <br /> QUALITY ASSURANCE An orderly assemblage of detailed procedures designed to <br /> PROJECT PLAN produce data of sufficient quality to meet the data <br /> (QAPjP) : quality objectives for a specific data collection <br /> activity. <br /> RCRA: The Resource Conservation and Recovery Act. <br /> REAGENT BLANK: See Method Blank. <br /> REAGENT GRADE: Analytical reagent (AR) grade, ACS reagent grade, and <br /> reagent grade are synonymous terms for reagents which <br /> conform to the current specifications of the Committee on <br /> Analytical Reagents of the American Chemical Society. <br /> REAGENT WATER: Water that has been generated by any method which would <br /> achieve the performance specifications for ASTM Type II <br /> water. For organic analyses, see the definition of <br /> organic-free reagent water. <br /> REFERENCE MATERIAL: A material containing known quantities of target analytes <br /> in solution or in a homogeneous matrix. It is used to <br /> document the bias of the analytical process. <br /> SPLIT SAMPLES: Aliquots of sample taken from the same container and <br /> analyzed independently. In cases where aliquots of <br /> samples are impossible to obtain, field duplicate samples <br /> should be taken for the matrix duplicate analysis. These <br /> are usually taken after mixing or compositing and are used <br /> to document intra- or interlaboratory precision. <br /> STANDARD ADDITION: The practice of adding a known amount of an analyte to a <br /> sample immediately prior to analysis. It is typically <br /> used to evaluate interferences. <br /> STANDARD CURVE: A plot of concentrations of known analyte standards versus <br /> the instrument response to the analyte. Calibration <br /> standards are prepared by successively diluting a standard <br /> solution to produce working standards which cover the <br /> working range of the instrument. Standards should be <br /> prepared at the frequency specified in the appropriate <br /> 4. <br /> ONE - 28 Revision 1 <br /> July 1992 <br />