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� per. .prk r + F i------- ... BATCH QC REPORT: Definitions and Terms Accuracy The ability of a procedure to determine the"true'concentrador_of an analyte Precision The reproducibility of a procedure demons;traced by the agreement between anal,ses performed on either duplicates of the sante sample or a pair of duplicate spikes Batch A group of samples anJ-yzed sequentially using the x3me calibration curve, reagents,and instrument Laboratory Laboratory magent water spiked with known compounds and subjected to the Control Standard same procedures as the samples. The LCS thus indicates the accuracy of the - (LCS) analytical meu;od and,because it is prepzrcd from a different source than the standard used to calibrate the instrument,it also serves to double-check the calibration Matrix QC Quality contiol tests performed on actual client samples. For mo.st inorganic analyses,the laboratory uses a pair of duplicate samples and a spiked sample. For most organic analyses,the laboratory uses a pair of spiked samples (dupliea:e spikes) LC Result Laboratory result of an LCS analysis LT Result Expected ressilt,or true value.of the LCS analysis R 1,R2 Result: Result of the analysis of replicate aliquots of a sample.with RI indicating the first analysis of the sample and R2 its corresponding duplicate;used to determine precision S 1, S2 Result Result of the analysis of replicate spiked aliquots,with S I indicating one spike of the sample a,.-12 the second spike;used to determine precision and accuracy R Biu Result The average of replicate,analysis results S Bar Result: The average of spike analysis results Tuve value The theoretical,or expected,result of a spike sample analysis Percent The percentage of analyte recovered.. r, Recovery For LCS,the percent recovery calculation is: LC-LT x I W, For spike recoveries,the percent recovery calculation is:. _ (S Bar-Sample Concentra it on) x 100 Spike Amount Relative Percent Calculated using one of the following: Difference(RPD) -R Luz-5-22)J&100 (RI + R7)+2 (S 1+S2)+2 �- Blank Result The result of the analysis of a method blank,which is reagent water that is analysed using the same reagents,instrurrxnts and procedures as the samples in a batch;used to determine laboratory contamination Reporting Detec- BCA-assig-►ed limit bared on--but not the same as---method detection limits tion Limit(RDL) (MDLs)determined using EPA guidelines rr C.r".,h,sear