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M14,WMA <br /> M <br /> Tex +• <br /> w <br /> BATCH QC REPORT: Definitions and Terms f <br /> Accurtcv The ability of a procedure to determine the"true"concentration of an analyte <br /> ent <br /> Precision ;niaiysesropducibility of aerformed on ether duplicates of the samrocedure demonstrated e sample otr a pair Eecn <br /> duplicate spikes <br /> Batch A group of samples analyzed scquentiany 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 sante 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 the <br /> calibration <br /> Matrix QC Quality control tests performed on actual client samples. For most inorganic <br /> For most organic artaiyscsethe ls i aboir ratory fuses a pair of spiked sicate samples and a amplecd s sample. <br /> (duplicate spikes) <br /> LC Result Laboratory result of an LCS analysts <br /> LT Result Expected result,or true value,of the LCS analysis <br /> R 1,R2 Result' Result of the analysis of replicate aliquots of a sample,with Ri indicating the <br /> Cost analysis of the sample and R2 its corresponding duplicate;used to <br /> determine precision <br /> t of S1,S2 Result Relce of thle sample and SsIS of replicate <br /> the second pikked e used t tdetermine precision and <br /> P <br /> accuracy <br /> R Bar Result The average of replicate analysis results <br /> S Bar Result: 7be average of spike analysis results <br /> True value Thetheoretical,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 calculadion is: <br /> Bar- a 1c ni x 100 <br /> Spike Amount <br /> Relative Percent Calculated using one of the following: <br /> Difference(RPD) (Rl -IIIA-lam V_+$ M <br /> (R1 +R2)-t-2 <br /> Blank Result 'nte result of the analysis of a method blank,which is reagent water that is <br /> analyseda [ gtete ' contamination <br /> Instiuments and <br /> procedures <br /> cedures as the samples <br /> in a ausedrdemine laboratory <br /> ` Reporting Detec- BCA-assigned limit based on—but not the same as--method detection limits <br /> tion Limit(RDL) (MDL.$)determined using EPA guidelines <br /> B C.lrnlrtirgt <br />