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CORE LABORATORIES <br />',~,~ <br />' WesurnAtlas <br />International <br />..~,o.,. rA. <br />TITI F <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />SOP N0. REVISION N0. EFFECTIVE DATE PAGE <br />1 HC-QAC-02 0 1 /06192 65 of 104 <br /> <br /> All requirements shall be followed by the analyst as stated in the applicable <br /> method. <br />1 <br /> Any deviation from any method requirement must be approved by the <br /> laboratory manager or section supervisor and be completely documented. <br /> Copies of method deviation documentation should be k@pt on file in the <br /> laboratory QA/QC office and in the corporate quality assurance department. <br /> Summaries of analytical method requirements for organic, metals, and <br /> inorganic parameters are provided in the Laboratory Documentation Manual. <br /> 12.4 Detection Limit Studies <br /> Detection limits should be established for all analytes on ea4h instrument. If <br />' required, the detection limit should also be determined for each different <br /> sample matrix analyzed. <br />' A minimum of seven replicates of a standard prepared at a concentration 2-5 <br /> times the estimated detection limit should be analyzed. The method detection <br /> limit can then be calculated by multiplying the standard deviation of the <br />analytical results by the students' t-value for the numb@r of replicates <br /> analyzed (3.14 for 7 replicates). <br /> Instrument detection limit studies should be performed annually and results <br /> shall be kept on file with the QA(QC coordinator. <br />' 12 <br />5 M <br />th <br />d C <br /> , <br />o <br />ompetency <br />e <br />' Prior to performing analyses, the laboratory shall demonstratQ proficiency in <br /> the method. This shall be accomplished according to guidelines set forth in <br /> the applicable method. <br />' <br /> If no guidelines are stated, the laboratory shall analyze multiple control <br /> samples to demonstrate adequate precision and accuracy. <br /> <br /> Demonstration of method proficiency shall be completely documented and <br /> kept on file with the QA/QC coordinator. <br />' <br /> <br />