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K y <br /> - <br /> 9' <br /> [3A'i'CH QC RCl'OR'I': Definitions and Terms <br /> Accuracy The ability of a procedure to determine the"true'concentration of an analyte <br /> the <br /> ement <br /> Precision analyses performed on eof a ither duplirocedure cates of the saemonstrated me sample or a pair o fees <br /> duplicate spikes <br /> Batch A group ui samples analyzed sequentially using the sarne calibration curve, <br /> reagents,and instrument <br /> Laboratory Laboratory reagent water spiked with known compounds and subjected to the <br /> Control Standard Sannaaly i ocedures as the al method and,because it sples. lprepared from a different source than the <br /> LCS thus indicates die accuracy of the <br /> (LCS) <br /> standard used to calibrate the instrument,it also serves to double-check the <br /> calibration <br /> Matrix QC Quality control torts ail client samples- inorganic <br /> analyses,the laboratory uses a pair samples and spiked sample. <br /> For most organic analyses,the laboratory 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 /> R1,R2 Result: Result of the analysis of replicate aliquots of a sample,with R;indicating the <br /> fust analysis of the sample and R2 its corresponding duplicate;used to <br /> determine precision <br /> cabg <br /> ne <br /> S 1,S2 Result Result <br /> oof f the sampanalysis <br /> e ar,d 5Of 2 the secte ond d spikked e used to determiuots,Wity,SI ne precision and <br /> spike <br /> accuracy <br /> R Bar Result The average of replicate analysis results <br /> S Bar Result: The average of spike analysis results <br /> True value <br /> the theoretical,or expected,result of a spike.,sample analysis <br /> Percent The percentage of analyte recovered. <br /> Recovery For LCS,the percent <br /> recovery percent rltxalvno caiculatiion isX 100 <br /> For spike recoveres,the pe tY <br /> a�. Samnle� o X 100 <br /> Spike Amount <br /> i <br /> Relative Percent Calculated using one of the following: <br /> axi <br /> Difference(RPD) (R 121)+ ($1 +S 2 <br /> at is <br /> Blank Result lite result of han amc reagents,�numents and procedures as thch is Magent water etsamples <br /> analysed using <br /> in a hatch;used to determine laboratory contamination <br /> Dctcc- BCA-assigned]inti[based an <br /> not the s2tr�e as—method detection limits <br /> Reporting idelines <br /> don Limit(RDL) (HDLs)determined using EPA gu <br /> 11 G Analytical <br />