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BATCH QC REPORT: Definitions and Terms � Accuracy The ability of a procedure to determine the"true"conceneation of an analyte Precision -flee reproducibility of a procedure demanstrated by the agreement between analyses performed on either duplicates of the same sample or a pas of duplicate spikes Batch A group of samples analyzed sequentially using the same calibration curve,, reagents,and instrument Laboratory Laboratory reagent water spiked with known compounds and subjected to the Control Standard same procedures as the sarrtples. 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 the calibration Matrix QC Quality control tests performed on actual client samples. For most inorganic analyses,the laboratory uses a pair of duplicate samples and a spiked sample. For most organic analyses,the laboratory w�cs 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 f R1,R2 Result: Result of the analysis of replicate aliquots of a sample,with R1 indicating the first analysis of the sample and R2 its corresponding duplicate;used to dcterrrin--precision S 1,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 spik:sample analysis I Percent The percentage of analyte recovered Recovery For LCS,the percent recovery calculation is: LC+LTx 100 For spike mcoveri_s,the percent recovery calculadion is: (S Bar-SampleConcentratigni x 100 Spike Amount Relative Percent Calculated using one of the following: Difference(RPD) (R 1 -R2)x 100 (51 2}_x 109 (RI +R2) 2 (Sl +S2)+2 Blank Result The result of the analysis of a method blank,which is reagent water that is analysed using the same reagents,instruments and procedures as the samples in a batch;used to determine laboratory contamination Reporting Detec- BCA-assigned limit based on---but not the same as—method detection limits tion Limit(RDL) (NIDI determined using EPA guidelines 13 C Analytical