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BATCH QC REPORT: Definitions and Terms Accuracy The ability of a procedure to detenniur, the "true"concentration of alk analyte Precision The reproducibility of a procedure demonstrated by the agreement between analyses performed on either duplicates of the stone sample or a pair of duplicate spikes Batch A group of samples analyzed sequentially usiulg the same calibration curve, reagents,and hist.nrmerlt Laboratory Laboratory reagent 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 method and, because it is prepared from a different source than the standard used to calibrate.the instrument,it also serves to double-check die calibration Matrix QC Quality control tests performed on actual client samples. For most inorganic analyses, the laboratory uses a lair of duplicate samples and a spiked sample. For most organic analyses, the laboratory uses a pair of spiked samples (duplicate spikes) LC Result Laboratory result of an LCS analysis LT Result Expected result, or true value, of the LCS analysis �. Rl, R2 Result: Result of the analysis of replicate aliquots of a sample, with R1 indicating the first winlysls of Lie sample and R2 its corresponding duplicate; used to detenrune precision S1, S2 Result Result of the analysis of replicate spiked aliquots, with S 1 indicating one spike of the sample and S2 the second spike; used to determine precision and accuracy R Bar Result The average of replicate analysis results S Bar Result: - The average of spike analysis results True value The theoretical,or expected,result of a spike sample analysis Percent The percentage of analyte; recovered. Recovery For LCS, the percent recovery calculation is: LC f•LT x 100 For spike recoveries, ilre percent recovery calculadion is: S Bar- Sample Concentga&n) x 1(1(1 Spike Amount Relative Percent Calculated using one of the following: Difference (RPD) (RI - R2) x 100 (S I --_S2) x 100 (Rt +R2) +2 (S1 +S2)+ 2 Blank Result The result of the analysis of a method blank,which is reagent water that is analysed using the same reagents, irtsu-urnents and procedures as the samples in a batch; used to determine laboratory contartnination Reporting Detec- BCA-assigned limit based on—burnot die s. nie as—niethod drtectipr�fi its. tion Limit(IZDL) (MDLs) detenWried using r--PA guidelines ►«rt«ur