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~ f/fly <br />' Western Atlas <br />Intera4ationat <br />.o,... ~.e.. <br />CORE LABORATORIES <br />I. ~ r I F -- _.__ <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />SOP N0. REVISION N0. EFFECTIVE DATE PAGE <br />HC-QAC-02 0 1 /06/92 71 of 1 <br />1 <br /> matrix spike duplicate analyses vary considerably by method and are <br /> covered during analytical method training. <br /> <br /> Blank Spike <br /> Blank spikes are formulated from laboratory pure water which is spiked <br /> with target analytes prior to sample preparation and analysis. <br />' Blank spikes are often analyzed if sufficient field sampl@ volumes are not <br /> provided for matrix spiking. <br />' Blank spikes are used to measure the percent recovery pf target analytes <br /> in an interference-free matrix. <br /> Internal Standards - Oroanics Analvsis <br /> Internal standards are non-target analytes of known concentration which <br />' are added to the samples following sample preparation but prior to <br /> instrument analysis. <br />' Internal standards are used to measure the efficiency of the instrumentation <br /> in quantifying target analytes and for performing calculations by relative, <br /> response factors. <br /> Surrogate Spikes -Organics Analvsis <br />' hi <br />S <br /> ch are <br />urrogate spikes are non-target analytes of known concentration w <br /> added to the samples prior to sample preparation and instirument analysis. <br />Surrogate spikes are used to measure the efficiency of all steps of the <br />sample preparation and analytical method in recovering target analytes from <br />' the sample matrix. <br />It is assumed that the non-target surrogate compounds b@have identically II <br />' to the target analytes in the method. <br />Field Sample Spikes <br />,i <br /> <br />