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1 <br />'®~~® <br />Western Atlas <br />International <br />CORE LABOF~ATORIES <br />ITLE <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />ISOP N0. <br />HC-QAC-02 <br />REVISION N0. jEFFECTIVE GATE IPAtkE <br />0 <br />ReferencelLCS standards should be analyzed once per batch of <br />where available. <br /> <br /> <br /> <br />1 <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />The analyzed recovery value must be within 90-1 10% ofl the known value.) <br />When available, the recovery limits which are specified by the source of the <br />reference standard (EPA, NBS, etc.) should be used. <br />The following quality control guidelines apply to the majority of ge <br />inorganic analyses which are performed on-site. <br />pHlAlkalinity/Acidity <br />• pH meters must be calibrated daily or at each use. <br />• Calibration verification using two buffer solutions at a IpH of 4, 7, or 10I <br />must be performed prior to sample analysis. <br />• A method blank and reference standard (if available) must be analyzed with) <br />each sample batch. <br />• Laboratory duplicates must be analyzed once per batch pr at a frequ <br />of 10% of the sample population, whichever is greater. <br />• Matrix spikes are not required. <br />Gravimetric Parameters <br />• An analytical balance with a resolution of 0.0001 grams slhould be used fort <br />the majority of gravimetric parameters. Top-loading balances may be used <br />for certain parameters, such as percent moisture. <br />• Drying ovens used for gravimetric analysis must be monitored for correct <br />temperature adjustments on a daily basis (see section 9.2). , <br />• A method blank and reference standard or stock standard lif available) must f <br />be analyzed with each sample batch. <br />• Laboratory duplicates must be analyzed once per batch or at a frequency' <br />of 10°10 of the sample population, whichever is greater. <br />