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~ ~l~l~, <br />western Auae CORE LABORATORIES <br />InterPational <br />* 1 T 1 F <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />' SOP N0. REV1510N ND. EFFECTIVE DATE PAGH <br />HC-QAC-02 0 1!06!92 80 of 104 <br />' <br /> when sample extractions for semivolatiles, pesticides or herbicides are <br /> performed. <br />' <br /> Extraction Blanks <br />' Extraction blanks must be analyzed every time samples are extracted. This <br /> extraction blank must be the same matrix type as the samples being <br />' processed. Purified silica sand may be used as an extraction material for <br />soil/sludge matrices <br /> . <br />' InitiallContinuing Calibration Verification <br /> An initial calibration must be performed every time that a GC column is <br /> replaced, the mass spectrometer source is cleaned or repaired, or any time <br />' major modifications are made to the instrument system. Daily calibrations are <br /> required to verify proper equipment operation prior to sample analysis. If the <br />' daily calibration verification does not meet method-specified acceptance <br /> criteria, a new initial calibration must be performed. Acceptance criteria for <br /> intial and continuing calibration verifications are provided in the applicable <br />' analytical method. <br /> Svstem Performance Standard <br /> <br /> GC/MS system performance check standards ituning compounds) must be <br /> analyzed daily for volatile and semivolatile analyses. <br /> <br /> Surrogate Recoveries <br />' Surrogates are required for volatile, semivolatile, pesticide, and herbicide <br /> analyses. <br /> Surrogate recoveries must meet the method-specified QC limits. When <br /> surrogate recoveries do not meet the method-specified criteria, that sample <br /> must be reanalyzed. If surrogate recoveries on the reanalysis still do not meet <br />' method-specified limits, a probable matrix interference problem exists, and the <br /> sample data should be qualified as estimated. Do not report these results <br /> until the data has been reviewed and approved by the laboratory section <br /> supervisor or the QA/QC coordinator. <br />1 <br />