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"'i�JLx [ r i.�.c° <br /> BATCH QC REPORT: Definitions and Terms ` <br /> Accuracy The ability of a procedure to determine the"true"concentration of an analyte <br /> Precision "Ilse reproducibility cf i procedure demonstrated by the agreement between <br /> analyses 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 procedures 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 tho <br /> calibration <br /> lblatrix 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 analyses,the laboratnry 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 Rl indicating the <br /> ' first analysis of the sample and R2 its corresponding duplicate;used to <br /> determine precision <br /> S1,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 /> ll� S Bar Result: The average of spike analysis results <br /> a? <br /> True value 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+LT x 100 <br /> For spike recoveries,the percent recovery calcaladion is: <br /> (S Bar-Samnle ncen_trationl x 100 <br /> Spike Amount <br /> Relative Percent Calculated using one of the following: <br /> Difference(RPD) (R I -921 x 100 (St _SZ)X 109 <br /> (RI +R2)+2 (51 +S2)+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 /> Repotting Detec< BCA-assigned limit based on—but not the same as--method detection limits <br /> tion Limit(RDL) (MDLs)determined using EPA guidelines <br /> U C Annlrlfcal <br />