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Y <br /> W <br /> intended as a check of techniques, methodology, equipment and <br /> -� standards. <br /> Standards: <br /> A known reference concentration of analyte to which <br /> environmental samples are compared. <br /> E { <br /> 3 <br /> Calibration standards: <br /> 1 <br /> ( The graduated dilutions of stock analyte solutions prepared <br /> to establish the standard curve or calibration curve for a <br /> particular analyte. <br /> Calibration Check standard: <br /> The verification of instrument response by analyzing a <br /> t standard prepared from a different manufacturer and or <br /> ^- different lot than that of the calibration standard. It is <br /> an evaluation of calibration performed concurrently with <br /> sample analysis. <br /> { F. <br /> t Standard Curve: <br /> A graph of the calibration standard concentration versus <br /> .,. instrument response for an analyte. The standard curve <br /> descirbes the linear quantitation range for an analyte. The <br /> concentration of analyte in an environmental samples can then <br /> be calculated from the response factor of the sample. <br /> Standard operating Procedure (SOP) : <br /> An operation, analysis or action whose mechanics are <br /> thoroughly prescribed and documented and which is commonly <br /> accepted as the usual or normal method for performing certain <br /> routine or repetitive tasks. <br /> surrogate: <br /> Organic Compounds which are similar to analytes of interest <br /> in chemical composition, extraction and chromotography, but <br /> - - <br /> 22 -- - <br />