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' CORE LABORATORIES <br />~~~,~ <br />Western Aslas <br />International <br />.,.,.,v.... m.... <br />1 ~rlrtE <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />' SOP N0. REVISION N0. EFFECTIVE GATE PAGH <br />HC-QAC-02 0 1 /06!92 75 of 104 <br /> <br /> Analyzed value must be ± the method detection limit or applicable reporting <br /> limit. <br />' <br /> InitiJContinuing Calibration Verification Standards <br /> At a minimum, calibration verification standards must be analyzed once prior <br /> to sample analysis and again at the completion of sample an>lysis. For larger <br /> sample batches, analyze continuing calibration standards at a frequency of <br />' 10% of the sample population. <br />~ The analyzed recovery value for calibration verification standards must be <br />' within 90-110°!° of the known value. <br /> The correlation coefficient for calibration curves should be > 0.995 for the <br />' majority of inorganic analysis. <br /> Laboratory Duplicates <br /> Laboratory duplicates (matrix duplicates) must be analyzed once per batch of <br />' samples or at a frequency of 10% of the sample populatiolh, whichever is <br /> greater (sample volume permitting). <br />' Where the analyzed value is <_ 5 times the method detection limit, duplicate <br /> values must agree within t the applicable reporting limit. <br />' Where the analyzed value is > 5 times the method detection limit, duplicate! <br /> value must agree within s 20% of the relative percent difference. i <br />' Matrix Spikes II <br /> Matrix spikes (where applicable) must be analyzed once per batch of samples ~~ <br />' or at a frequency of 5% of the sample population, whichever is greater li.e., <br /> 1-20 samples, 1 spike; 20-40 samples, 2 spikes, etc.). Certain parameters <br />' require matrix spikes at a frequency of 10%. <br />I <br /> The analyzed recovery value must be within 75-125% of the known value. <br />' Reference/LCS Standards <br /> <br />