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B C ANALYTICAL <br /> ORDER QC REPORT <br /> Definitions and Terms <br /> Accuracy: The ability of a procedure to determine the "true" <br /> concentration of an analyte. <br /> Precision: The reproducibility of a procedure demonstrated by the <br /> agreement between analyses performed on either dupli- <br /> cates of the same sample or a pair of duplicate spikes . <br /> Batch: A group of twenty samples or less, of similar matrix <br /> type, prepped together or analyzed together if no <br /> sample preparation is required, under the same <br /> conditions and with the same reagents . The batch must <br /> include a method blank, LCS and matrix QC . <br /> Laboratory A blank that is spiked with a known amount of analyte <br /> Control and subjected to the same procedures as the samples . <br /> Standard The LCS indicates the accuracy of the analytical <br /> (LCS) : method. It also serves to double-check the calibration <br /> because it is prepared from a different source than the <br /> standard used to calibrate the instrument. <br /> Matrix QC: Quality control performed on actual client samples . <br /> The matrix spike is a client' s sample spiked with a <br /> known amount of analyte. For most analyses, the <br /> laboratory performs matrix spikes in duplicate <br /> (duplicate spikes ) . <br /> Method A sample that contains no analyte. For water analysis , <br /> Blank: organic-free or deionized water is used. For solids <br /> analysis, analyte-free solvent is used. The method <br /> blank serves to measure contamination associated with <br /> laboratory storage, preparation or instrumentation. <br /> Batch Numeric designation for a batch of samples and the <br /> lumber: associated QC. The batch number sequence is unique for <br /> each determination. <br /> LC Result: Laboratory result of an LCS analysis . <br /> 'JT Result: Expected result, or true value, of the LCS analysis . <br /> ?ercent The percentage of analyte recovered. For LCS, the <br /> Recovery: percent recovery calculation is : LC/LT x 100 . <br /> B C Analytical <br />