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_ r a <br /> n <br /> - s <br /> is Gw <br /> i <br /> BROWN AND CALDWELL ANALYTICAL L.ABORATURIES <br /> BATCH QC REPORT <br /> Definitions and Terms <br /> Accuracy: The ability of a procedure to determine the`true'conation of an <br /> analyte. <br /> Batd: A group of samples analyzed sequentiany using the same calibration curve, <br /> reagents,and instrumeat. <br /> z : <br /> Labwnmy Cool Laboratory reagentwater spiked with known compounds and subjected <br /> Standard(L.CS): to the same procedures as the samples. The LCS thus indicates the accuracy <br /> a of the analydcal method and,because it is prepared from a different source <br /> thea the standard used to calibrate the instrument,it also serves to double- <br /> check the ca} . <br /> LC Result: Laboratory result of an LCS analytes. <br /> LT Result Expected result,or true value,of the L,CS analysis. <br /> matrix QC: QLmlity control tests performed on acAual client samples. For most inorganic <br /> analyses,the laboratory rases a pair of duplicate samples and a spiked <br /> sample. For most organic analyses,the laboratory uses a pair of spiked <br /> ". samples(duplicate spikes). <br /> Percent Recovery: The percentage of analyte rccovcre CL <br /> r a For LSCS,the percent recovery calculation is <br /> LC-LT x 100. <br /> For spike recoveries,the percent recovery calculatHon is <br /> fS Bar-„&mpk Qoncarriradonl x 100 <br /> Spike Amount <br /> Precision: The reproducr"hdfity of a procedure demonstrated by the agreement between <br /> f” analyte performed on either duplicates of the same sample or a pair of <br /> duplicate spikes. <br /> R1,R2 Result: Result of the analysis of replicate aliquots of a sample,with R1 indicating <br /> the first analy;pis of the sample and R2 its corresponding duplicate;used to <br /> determineprecision. <br /> Relative Percent Calculated using one of the following: <br /> Difference(RPD): <br /> 1 �x 100 (S1-S2U 100 <br /> (RI+R2)-2 (S1 +S2 -2 <br /> } <br /> S-Bar Result-- ----The average of spike arralysas results.- -- ------- - -- --__ <br /> S l; S2 Result Result of the analysis of replicate spiked aliquots,with S 1 indicating one <br /> spike of the sample and S2 the second spike;used to determine pTodskm <br /> and accautacy. <br /> True value: The theoretical.or expecttd,result of a spike sample analysis. <br /> It CA 111dWroll <br />