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BROWN AND CALDWELL ANALYTICAL LABORATORIES <br /> BATCH - IrtB�[?RT <br /> Deftitions and Terms <br /> A=zracy; The ability of a procedure to determine the'true"concentration of an <br /> azualyte. <br /> Batch: A group of samples analyzed sequentially using the same calibration terve, <br /> reagents,and instrument. <br /> Laboratory Omtral Laboratory reagent water spiked with kuoam gads and subjected <br /> " Standard(LCs): to the same promdures as the samples. The US thus indicates the any <br /> of the analytical method and,because it is prepared fram a different source <br /> thea the standard used to calibrate the instn=ent,it also serves to doubke <br /> check the calibration. <br /> LC Recruit Laboratory result of an LCS analysts. <br /> LT Result: Expected result,or true value,of the LCS analysis• <br /> Matrix(�!�` Quality control tests performed on actual clicat samples. For most inorganic <br /> analyses,the laboratory uses a pair of dupllae samples and a spiked <br /> sample. For most organic analyses,the laboratory uses a pair of sped <br /> samples(duplicate spikes). <br /> Percent Recovery: The permntage of analyte recover. <br /> For LCS,the percent recovery Sze is <br /> i LC=LTx100. <br /> For spike reveries,the percent recovery calculatiion is <br /> (5 PA, Sam2k m9mWigm X 100 <br /> Spike Amount <br /> Precision: The rEprodu�ty of a procedure demonstrated by the agmenbent between <br /> analyses performed on either duplicates of the same sample or a pair of <br /> duplicate spikes. <br /> f: <br /> RI,R2 Result Result of the analysis of replicate aliquots of a smmple,with RI indicating <br /> the first analysis of the sample and R2 its corresponding duplicate;used to <br /> determine precision. <br /> Relative Percent Calculated using one of the following: <br /> ^� Difference(RPD). <br /> (El -FZ x 100 a -52LKJ&O— <br /> ..2 <br /> S Bar Result The average of spike analysis resuhs. <br /> S 1, S2 Result Result of the analysis of replicate spiked aliquots,with S 1 indicating one <br /> spUlw of the sample and S2 the second spike;used to determine n <br /> and accuracy. <br /> Tuve value: Ths theoretical,or expected,result of a spike sample analysts- <br /> rr r..�r„,ryNc„r <br /> x _ <br />