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BROWN AND CALDWE.LL ANALYTICAL LABORATORIES SEP <br /> BATCH QC REPORT ;°3viRONMENTAL HFA"�+ <br /> Defuutions and Terms PERMIT/SERVICES <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 /> reagents, and instrument. <br /> i <br /> Laboratory Control 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.Result: Laboratory result of an LCS analysis. <br /> LT Result: Expected result, or true value,of the LCS analysis. <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 calculatioa is <br /> LC + LTx 100. <br /> For spike recoveries, the percent recovery calculatlion is <br /> (S Bax`- Sample Concentration} 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 1, R2 Result: Result of the analysis of replicate aliquots of a sample, with R 1 indicating <br /> the first analysis of the sample and R2 its corresponding duplicate; used to . <br /> det:erraine precision. <br /> Relative Percent Calculated using one of the following: <br /> Difference(RPD): <br /> (R I - R2) x 100 (Sl - S2) x 100 <br /> (RI + R2) _ 2 (SI + 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 I 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 />