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r � <br /> - 4 <br /> EMU <br /> E f Iir- <br /> BROWN AND CALDWELL,ANALYTICAL LABORATORIES <br /> BATCH QC REPORT <br /> -� Definitions and Terms <br /> Accuracy The ability of a ire to determine thetrue"cmxentratim of an <br /> analyte. <br /> Batch A group of samples analyzed sequen ally using the same calibration curve, <br /> reagents,and instrtvnent. <br /> Laboratory Control Laba utory reagentarater Wised with Dawn compounds and subjected <br /> Standard(LCS): to dw sane p:ocedum-as the samples. The LCS thus Indicates the ac anucy <br /> _, of the analytical nletllOd and,becaL:se it is prepared from a different source <br /> than lite standard used to calit:aratc the fi sttument,it also serves to double- <br /> check the calibration. <br /> LC Result: Laboratory result of an LCS analysis. <br /> LT Result; meted result,or true value,of the LCS analysis. <br /> matrix QC: Quality control tests performed on actual client snVles. For most inorganic <br /> snalydes,the lab mtnry uses a pair of duplicate umples and a spiked <br /> sample. For most organic analyses,the laboratory uses a pair of spr5zd <br /> samples(dupnwe spikes). <br /> j Percent Dover): Ike percmitage of analyse recovered. <br /> For LES,the percent recovery calculation is <br /> LC LT x 100. <br /> For spike recoveries,the percent revery calculat is <br /> X100 <br /> { Spike Amount <br /> i <br /> r. Pression: 'the reprodumbft of a pvicedure demonstrated by tin aV-eement betumen <br /> analyses performed on either motes of the same sample or a pair of <br /> '- duplicate spikes. <br /> RI,R2 Results Result of the analysis of replicate aliquots of a sample,with Rl indicating <br /> t�t analysis of the sample and R2 Its=responding duplicate;used to <br /> ne r- <br /> 4; <br /> Relative Pesoent Calculated using one of 1he following: <br /> `- <br /> Difference(RPD): <br /> Igl—IL21 x 1 C,0 (Al -521 x 100 <br /> (Rd +R2) 2 (S1 +S2) -2 <br /> S Bar Result: The average of spike anaiyds rte. <br /> - - ----- <br /> S1, S2 Result: - - — Result of the analysis of replicate sped aliquots,with S 1 indicating one <br /> vike of the sample and S2 the second spike;used to determine precision <br /> ;�✓` and aoarracy+ <br /> True value: The theoretical.or expelled,result of a spice sample ana4rsis. <br /> li C.inrelsliru! <br /> rri� <br />