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�. - <br /> WIN <br /> _ 9 n4 r.yyy�r <br /> Yom+ <br /> BROWN AND CALDWELL ANALYTICAL LABORATORIES <br /> BATCH QC REPORT <br /> Definitions and Terms <br /> Accuracy The ability of a procediurc to determine the"true'coa=ntration of an <br /> analyte. <br /> Batch. A group of samples analyzed sequentially using the same calibration curve, <br /> reagents,and instrument. <br /> Laboratory C;ontr tai Labcutory reagent watef spiked witlu k amm cob-, aunds and subjected <br /> Standard(LCS): to the same prmcedures as the samples. The LCS taus.indicates the spy <br /> of the analytical method and,because it is prepared from a different source <br /> thea the standard used to cehlrate the hotrcmment,it also=ves to double- <br /> check the calibrathm <br /> LC Result: Laboratory result of an LCS analysis. <br /> LT Result: Expected result,or true vahre,of the LCS analyte. <br /> Matrix QC: Quality control term performed on actual client samples. For most morganic <br /> analyses,the labaratary um a pair of duplicate samples and a spiked <br /> sample. For most organic analyses,the laboratory uses a pair of spuTCed <br /> samples(duplicate spfeg) <br /> i <br /> a9 <br /> x ` ` int Reoovery: The percentage of analyte rewvw:(L <br /> ,�. For LCS,the percent recovery calculation is <br /> LC+LT x 100. <br /> For spike reveries,the percent reoovery calc ulatilon is <br /> ( Sarcode Concentxatioa) x 100 <br /> . Spike Amount <br /> Precision: The rqm udu [ty of a procedure detxicnstrated by the agreement between <br /> analyses performed on either duplicates of the same sample or a parr of <br /> duplicate sp0.ces. <br /> Rl,R2 Result Result of the analysis of replicate aliquots of a sample,with Rl indicating <br /> the first analysis of the sample and R2 its con esponding duplicate;used to <br /> dd=aine precision. <br /> Relative Percent Calculated fusing one of the following: <br /> Difference(RPD): <br /> (R1 -R2)x 100 (Sl -52)X LN <br /> (Rl +R2)_2 (S1 +S2) _2 <br /> S Bar Result The average of spike analysis results. <br /> Sl, S2 Result Result of the analysis of replicate spiked aliquots,with S 1 indicating cure <br /> splice of the sample and S2 the second spike;used to determine precise;Q <br /> and ac cuts y. <br /> True value: The theoretical,or expected,result of a spine sample analysis. <br /> : 6 <br /> !Z f..lnnlvricn! <br />