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BATCH QC REPORT: Definitions and Terms <br /> Accurscv The ability of a procedure to determine the "true" concentration of an analyte <br /> Precision The reproducibility of a procedure demonstrated by the agreement between <br /> analvses performed on either duplicates of the same sample or a pair of <br /> duplicate spikes <br /> Batch A group of samples analyzed sequentially using the same calibration curve, <br /> reagents, and instrument <br /> Laboratory Laboratory reagent water spiked with known compounds and subjected to the <br /> Control Standard same proceaures as the samples. The LCS thus indicates the accuracy of the <br /> (LCS) analytical method and, because it is prepared from a different source than the <br /> standard used to calibrate the instrument, it also serves to double-check the <br /> calibration <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 sample. <br /> For most organic anaiyses, the laboratory uses a pair of spiked samples <br /> (duplicate spikes) <br /> LC Result Laboratory result of an LCS analysis <br /> LT Result Expected result, or true value, of the LCS analysis <br /> RI,R2 Result: Result of the analysis of replicate aliquots of a sample,with RI indicating the <br /> first analysis of the sample and R2 its corresponding duplicate; used to <br /> determine precision <br /> S 1, 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 precision and <br /> accuracy <br /> R Bar Result The average of replicate analysis results <br /> S Bar Result: The average of spike analysis results <br /> True values The theoretical,or expected,result of a spike sample analysis <br /> Percent The percentage of analyte recovered. <br /> Recovery For LCS, the percent recovery calculation is: LC-s-LT x 100 <br /> For spike recoveries,the percent recovery calculadion is: <br /> ar- Sa } entration x 100 <br /> Spike Amount <br /> Relative Percent Calculated using one of the following: <br /> Difference(RPD) (RI - R2) x 100 (SI - S2) x 100 <br /> (RI + R2) i2 (SI + S2)-i- 2 <br /> Blank Result The result of the analysis of a method blank,which is reagent water that is <br /> �.. analysed using the same reagents, instruments and procedures as the samples <br /> in a batch: used to determine laboratory contamination <br /> Reporting Detec- BCA-assigned limit based on—but not the same as—method detectiorrlitnits <br /> tion Limit(RDL) (MDLs) determined using EPA guidelines <br /> l..{gd�YllflfE <br />