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~~~,~ COAE LABOF3ATOg1E5 <br />' ~ryrastern Atlpe <br />International <br />.,,a.o~.c .o.~ <br />' r i r I F <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />SOP ND. REVISIDN N0. EFFECTIVE DATE PAGE <br />HC-QAC-02 0 1/06/92 80 of 104 <br />when sample extractions for semivolatiles, pesticides or herbicides are <br />performed. <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 />soiUsludge matrices. <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 />1 analytical method. <br />' Svstem Performance Standard i <br />GC/MS system performance check standards (tuning compovlndsl must be I <br />' analyzed daily for volatile and semivolatile analyses. <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 />t <br />