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~ ~//% <br />' Western Atlas <br />International <br />ie.~oe. tee. <br />CORE LABOFRATORIES <br />1 <br />1 <br /> <br /> <br />1 <br />IT1T1 F ti I <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />SDP N0. REVISION ND. EFFECTIVE DATE PAGE <br />HC-QAC-02 0 1/06/92 65 of 104 <br />All requirements shall be followed by the analyst as stated in the applica <br />method. <br />Any deviation from any method requirement must be approved by the <br />Laboratory manager or section supervisor and be complbtely documented. <br />Copies of method deviation documentation should be kept on file in the <br />laboratory QA/QC office and in the corporate quality assurance department. <br />Summaries of analytical method requirements for orgpnic, 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 e8ch instrument. If <br />required, the detection limit should also be determined for each different <br />sample matrix analyzed. <br /> <br />1 <br /> <br /> <br /> <br />1 <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 number of replicates <br />analyzed (3.14 for 7 replicates). <br />Instrument detection limit studies should be performed anlhually and results <br />shall be kept on file with the QA/QC coordinator. <br />12.5 Method Competency <br />Prior to performing analyses, the laboratory shall demonstri~te proficiency in <br />the method. This shall be accomplished according to guiddlines set forth in <br />the applicable method. <br />If no guidelines are stated, the laboratory shall analyze multiple control <br />samples to demonstrate adequate precision and accuracy. <br />Demonstration of method proficiency shall be completely documented and <br />kept on file with the QAIQC coordinator. <br /> <br />