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~,~~~ CORE LABORATORIES <br />Wesrtern Atlas <br />International <br />' T I T L E <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />SOP N0. REVISION N0. EFFECTIVE DATE PAGE <br />Nc.nnc_m n ~rnaro~ ~a nF Tnn <br /> <br /> • Initial calibration verification standards must be analyzed prior to field <br /> sample analyses. <br />' • Continuing calibration verification standards must be analyzed once per <br /> batch or at a frequency of l0% of the sample population, whichever is <br />' greater. <br /> • A method blank and reference standard or stock standard (if available) must <br /> be analyzed with each sample batch. <br /> • Laboratory duplicates must be analyzed once per batch or at a frequency <br />t of 10% of the sample population, whichever is greater. <br /> • Matrix spikes must be analyzed once per batch or at a fr@quency of 10% <br />' of the sample population, whichever is greater. <br /> • Calculate concentrations using linear regression on a sciehtific calculator. <br />' Correlation coefficient, slope, and Y-intercept values must be calculated <br /> and recorded for all standard lines. <br />' I l P <br />t <br /> n s <br />rumenta <br />arameters <br /> Method-specified calibration procedures, frequency requirements, and <br />' acceptance criteria must be followed (see section 12.0). <br />' Manufacturers' equipment guidelines and maintenance schedules must be <br /> followed (see section 12.0). <br /> • The correlation coefficient should be > 0.995 for the majority of <br /> instrumental parameters. <br />' • Initial calibration blanks must be analyzed prior to field sample analyses. <br /> • Continuing calibration blanks must be analyzed once per batch or at a <br />frequency of 10% of the sample population <br />whichever is greater <br /> , <br />. <br /> • Initial calibration verification standards must be analyzed prior to field <br />l <br />i <br />l <br /> ys <br />samp <br />e ana <br />s. <br />1 <br />