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<br /> <br /> <br />1 <br /> <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br />~,~,' <br />Western Atles <br />International <br />.. e.ro.... moo., <br />CORE LABORATORIES <br />IT I T I E I <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />SOP N0. REVISION N0. EFFECTIVE DATE PAGE <br />HC-QAC-02 0 1 /06/92 70 of 104 <br />This technique isolates laboratory performance from field sample matrix <br />related effects. <br />Laboratory control standards are normally analyzed once per analytica! <br />batch of samples. Method-specific frequency and acceptance criteria <br />requirements for LCS standards are taught during analytical method <br />training. <br />Method Of Standard Additions IMSAI <br />The method of standard additions requires the analysis of a series of field <br />samples which are spiked at increasing concentrations of the target <br />analytes. <br />This method of analysis provides a mathematical appro$ch to quantify <br />analyte concentrations when matrix interference problems are present. <br />Spikes <br />Spikes are analyzed to determine matrix interference probtenhs and measure <br />the accuracy and precision of laboratory sample preparation procedures and <br />analyses. Spike recovery performance criteria is provided in the applicable <br />analytical method. General inorganic guidelines are provided in Section 13.6. <br />Matrix Spike/Matrix Spike Duplicates <br />' Matrix spikes and matrix spike duplicates are two separate field sample <br />aliquots which are spiked with target analytes prior to sample preparation <br />' and analysis. <br />Matrix spikes and matrix spike duplicates measure the recov@ry of analytes <br />' in a specific sample matrix and are used to indicate matrix interference <br />problems. <br />' I Matrix spike duplicate analyses measure the laboratory precision achieved <br />between two separate analyses. <br />' I Where applicable, matrix spikes should be analyzed once per sample batch. <br />~ The frequency. and acceptance criteria requirements for matrix spike and <br />I <br />