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I~1 <br />~~`,' CORE LABOF#ATORIES <br />Western Atlas <br />Interpational <br />Ir17LE <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />SOP N0. REVISION N0. EFFECTIVE DATE PACE <br />HC-QAC-02 0 1 /06/92 75 of 104 <br /> <br /> Analyzed value must be t the method detection limit or applicable reporting <br /> limit. <br />' <br /> InitialLContinuino Calibration Verification Standards <br /> At a minimum, calibration verification standards must be alnalyzed once prior <br /> to sample analysis and again at the completion of sample analysis. For larger <br />' sample batches, analyze continuing calibration standards at a frequency of <br />10% of the sample population <br /> . <br />' The analyzed recovery value for calibration verification standards must be, <br />within 90-110% of the known value <br /> . <br /> The correlation coefficient for calibration curves should be > 0.995 for the <br />majority of inorganic analysis <br /> . <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 population, whichever is <br /> greater (sample volume permitting). <br /> Where the analyzed value is 5 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 difflerence. <br /> Matrix Spikes <br /> Matrix spikes (where applicable) must be analyzed once per Latch of samples <br />' or at a frequency of 5°!0 of the sample population, whichever is greater li.e., <br /> 1-20 samples, 1 spike; 20-40 samples, 2 spikes, etc.). Cettain parameters <br /> require matrix spikes at a frequency of 10%. <br />' <br /> The analyzed recovery value must be within 75-125% of the known value. <br />' Reference/LCS Standards <br /> <br />