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CORE LABOFiiQ-TORIES <br />~ ~///~ <br />ii ~ Western AUss <br />International <br />.e„o..,. re.sr <br />' Ir I r 1 E <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />' SOP NO. REVISIDN N0. EFf ECTIVE DATE PAGE <br />HC-QAC-02 0 1106/92 70 of 104 <br /> <br /> This technique isolates laboratory performance from field sample matrix <br /> related effects. <br /> <br /> Laboratory control standards are normally analyzed once 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 (MSAI <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 /> analyzes. <br />' This method of analysis provides a mathematical approach to quantify <br /> analyte concentrations when matrix interference problems are present. <br />' S Ikes <br /> Spikes are analyzed to determine matrix interference problems 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 SoikelMatrix Soike Duplicates <br /> l <br /> e <br />Matrix spikes and matrix spike duplicates are two separate field samp <br /> aliquots which are spiked with target analytes prior to sample 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 />' Where applicable, matrix spikes should be analyzed once per sample batch. <br />! The frequency. and acceptance criteria requirements for matrix spike and <br />