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~ ~l//~ <br />Western Atlas <br />International <br />.ow rn~v. <br />CORE LABORL4TORIES <br />Ii 17 t E <..~~= <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />' SOP N0. REVISION N0. EFFECTIVE GATE PAGE <br />HC-QAC-02 0 1(06/92 70 of 104 <br />' <br /> This technique isolates laboratory performance from fibid sample matrix <br /> related effects. <br /> <br /> Laboratory control standards are normally analyzed onc~e per analytical <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 (MSA1„~ <br />' <br />WW <br />`~ <br /> The method of standard additiprSs reg <br />i <br />res the analysis of a series of field <br />u <br />' samples which are spiked ~at' increasing concentrations of the target <br /> analytes. <br />' This method of analysis provides a mathematical approach to quantify <br /> analyte concentrations when matrix interference problerrhs are present. <br />' S ike <br />' Spikes are analyzed to determine matrix interference probldms and measure <br />the accuracy and precision of laboratory sample preparatiorh 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 />I' Matrix spikes and matrix spike duplicates are two separate field sample <br /> ', aliquots which are spiked with target analytes prior to saRnple preparation <br />' and analysis. <br /> Matrix spikes and matrix spike duplicates measure the recovery of analytes <br /> in a specific sample matrix and are used to indicate matrix interference' <br /> problems. <br />' Matrix spike duplicate analyses measure the laboratory precision achieved <br /> between two separate analyses. <br />' <br />I Where applicable, matrix spikes should be analyzed once p@r sample batch. <br />The frequency and acceptance criteria requirements for matrix spike and <br /> <br />