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BATCH QC fZEPORT: Definitions and Terms <br /> �lccuracv The ability of a procedure to determine the"true"concentration nf an analyte <br /> reproducibility of a procedure demonsu:ttcd by the agreement between <br /> [,recision <br /> analvses performed on either duplicates of the same sampir ora pair of <br /> duplicate spikes <br /> Batch A group of samples analyzed sequentially using the same calibmuon carve, <br /> reagents,and instrument <br /> Laboratory Laboratory reagent water spiked with known compounds and subjected to the <br /> Control Standard same procedures as the samples. The LCS ilius indicates the accuracy of the <br /> from a <br /> different source than e <br /> (LCS) stdmethod and. <br /> nrient, also serves double-check the <br /> standard used roalt <br /> calibmtion <br /> Matrix QC Quality control tests performed on actual client samples. For most inorganic <br /> analyses,the laboratory uses a pair of duplicate samples and a spiked sample. <br /> For most organic analvses,the laboratory uses a pair of spiked samples <br /> (duplicate spikas) <br /> LC Result Laboratory result of an LCS analysis <br /> LT Result Expected result.or true value,of the LCS analysis <br /> R 1, R2 Result: 1R-trrsst analysis of he sampleis of plicate and R2 its cors of a sample,withresponding pondi g duplicae;used aoing the <br /> determine precision <br /> S 1,S2 Result Result of the analysis of replicate spiked aliquots,with S 1 indicating one <br /> spike of the sample and S2 the second spike;used to determine precision and <br /> accuracy <br /> R Ear Result The average of replicate analysis results <br /> S gar Result: The average of spike analysis results <br /> True value The theoretical,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 y LT x 100 <br /> For spike recoveries,tht:percent recovery calculadion is: <br /> S Bar Sam le ncentrati n x 100 <br /> Spike Amount <br /> Relative Peirent Calculated using <br /> one of�the following:01-521�1� <br /> Difference(RFD) S 1 +52)y 2 <br /> (R1 + R2)y 2 <br /> Blank R^suit analysed <br /> n lysedlusing t`analysis <br /> reagents,instruments and procedures aswater <br /> the samples <br /> - --- <br /> in a baich;used to determine laboratory contamtnatton.. <br /> Reporting Detec BCA-assigned limit based on—but not the same as--method detection limits <br /> tion Limit(RDL) (MDLs)determined using EPA guidelines D c Ana Beal <br />