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r e <br /> s - prm <br /> s, <br /> F ry_ <br /> �s. <br /> BATCH QC RETORT: 1')efinitioIis attd 'I'crrns <br /> 1[cur,tc. "Ilse ability(if a procedure to determine the "true, concentration of an analyte <br /> Precision Tile reprcxiuC:)ilit.v of a proccciure demonstrated by the agreement between <br /> :utaivscs performed on other duplicates of the same sample or a pair of <br /> duplicate spikes <br /> Batch A group of samples analyrcd scnucntiaily using the same calibration curve, <br /> reagents.and instrument <br /> Laboratory Laboratorreagent water spiked with known compounds and subjected to the <br /> Laboratory <br /> Control Standard same procedures as thte samples. The LCS thus indicates the accuracy of the <br /> (LCS) analytical method and, because it is prepared from a different saurce 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 clicn[samples. For most inorganic <br /> analvses,the iaboratory uses a pair of duplicate sampies and a spiked sample. <br /> For most organic analvses.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 /> R 1,R2 Result: Result of the analysis of replicate aliquots of a sample,with RI indicating the <br /> first analysis of the sample and R2 its corresponding duplicate; Used to <br /> determine precision <br /> S 1, S2 Result Result of the analysis of replicate spiked aliquots,with S I indicating one <br /> spike of the sample and S2 the second spike;used to determine precision and <br /> accuracy <br /> R Barr Result The average of replicate analysis results <br /> S Bar 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 LT x 100 <br /> For spike recoveries,the percent recovery calculadion is: <br /> Bar-Sample C,�ncentmti n x 100 <br /> Spike Amount <br /> Reladve Percent Calculated using one of the following: <br /> Difference(RPD) (RI -R2)x 100_ (S 1 -S2)x IQQ <br /> (RI +R2)=2 (S1 + S2)�2 <br /> Blank Result The result of the analysis of a method blank,-which is reagent water that is <br /> --- - <br /> -analysed using the same reagents,instruments and procedures as the samples_____ <br /> in a batch:used to detesrnine.laboratory contamination <br /> Reporting Detec- BCA-assigned limit based on—but not the same as—method detection limits <br /> tion Limit(RDL) (LMDLs)determined using EPA guidelines <br /> 8 C dnal.vdca[ <br />