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I <br /> BROWN AND CALDWELL ANALYTICAL LABORATORIES <br /> BATCH QC REPORT <br /> Definitions and Terms <br /> Accuracy: The ability of a procedure to determine the"true"concentration of an <br /> analyte. <br /> Batch: :_ A group of samples analyzed sequentially using the same calibration curve, <br /> h reagents, and instrument <br /> Laboratory Conti of: Laboratory reagent water spiked with known compounds and subjected <br /> Standard(LCS): : to the same procedures as the samples. The LCS thus indicates the accuracy <br /> of the analytical method and, because it is prepared from a different source <br /> than the standard used to calibrate the instrument,it also serves to double- <br /> check the calibration. <br /> LC Results Laboratory result of an LCS analysis. <br /> LT Result result:,or true value of the LCS analysis. <br /> I <br /> ; Expected Y J <br /> Matrix QC: Quality control tests performed on actual client samples. For most inorganic <br /> analyses, the laboratory uses 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 recovered. <br /> For LCS,the percent recovery calculation is } <br /> LC _ LT x 100. <br /> t For spike recoveries, the percent recovery calculatiion Is <br /> (S Har- Sample Ccentrationl x 100 <br /> Spike Amount <br /> Precision: The reproducibility of a procedure demonstrated by the agreement between <br /> analyses performed on either duplicates of the same sample or a pair of <br /> duplicate spikes. <br /> R I, R2 Result; Result of the analysis of replicate aliquots of a sample, with R 1 indicating <br /> the fi -st analysis of the sample and R2 its corresponding duplicate;used to j <br /> determine precision. j <br /> Relative Percent Calculated using one of the following: <br /> Difference(RPD): <br /> (g l - R2)—x 100 (SI - S2)_x1 <br /> (R 1 + R2) = 2 (S 1 + S2) 2 <br /> S Bar Result: The average of spike analysis results. <br /> S1, S2 Result " Result of the analysis of replicate spiked aliquots,with S l indicating one <br /> spike of the sample and S2 the second spike; used to determine precision <br /> •-'� and accuracy. <br /> True value: The theoretical, or expected,result of a spike sample analysis. <br /> t <br /> +` C BROWN AND CALDWELL LABORATORIES <br />