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1 COF~E LABORATORIES <br />~ '~///~ <br />Western Atlas <br />International <br />a o.,.. v.... <br />f , G ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />' SOP N0. FEVISiON N0. EFFECTIVE GATE PAGE <br />HC-QAC-02 0 1/06/92 69 of 104 <br /> <br /> Standards are analyzed to measure the accuracy of laboratory analyses. <br /> Performance criteria for specific standard types are provided in the applicable <br />' analytical method. General inorganic guidelines are provided in Section 13.6. <br /> Calibration Standards <br /> <br /> Calibration standards are a series of formulated samples of precisely known <br /> concentrations of the target analytes in the expected range. <br /> Calibration standards define the working range and linearity of the analytical <br /> method and establish the relationship of the instrument response to the <br />target analyte concentration used to quantify field samples. <br /> <br /> The frequency, number of calibration points, and acceptance criteria for <br />' calibration standards varies considerably with the method. Calibration <br /> requirements for each method and instrument are taught during analytical <br />' method training. <br /> External Reference Standard <br />' i <br /> on <br />External reference standards are standards of known analyte concentrat <br /> obtained from an external source (EPA, NIST, etc.) other than the source <br />' of the standards which are used for instrument calibration, <br /> External reference standards are used to verify the accuracy of the <br /> calibration standards. <br /> At a minimum, external reference standards are analyzed after each initial <br /> calibration. Frequency and acceptance criteria for external reference <br /> standard analyses vary considerably with the method, Requirements for, <br /> each method and instrument are taught during analytical method training. <br /> <br /> Laboratory Control Standard (LCSI <br />1 Laboratory control standards (LCS) are standards of known analyte' <br /> concentration which are added to an interference-free matrix, such as, <br />1 laboratory pure water or solvent. <br /> <br />