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I' CORE LABORI4TORIES <br />~ f/f/~ <br />Western Aelas <br />International <br />%w. we.. <br />.,Ti <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />' SOP ND. REVISION ND. EFFECTIVE DATE PAGE <br />HC-QAC-02 0 1 /06192 71 of 104 <br />' <br /> matrix spike duplicate analyses vary considerably by method and are <br /> covered during analytical method training. <br />t <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 sample volumes are not <br /> provided for matrix spiking. <br /> Blank spikes are used to measure the percent recovery of target analytes <br /> in an interference-free matrix. <br /> Internal Standards -Organics 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 /> I <br />l <br />i <br />f <br /> nterna <br />on <br />the instrumentat <br />standards are used to measure the efficiency o <br /> in quantifying target analytes and for performing calculations by relative <br /> response factors. ~, <br /> Surrogate Spikes -Organics Analvsis it <br />' <br /> Surrogate spikes are non-target analytes of known concentration which are <br /> added to the samples prior to sample preparation and instrument analysis.) <br />' <br /> Surrogate spikes are used to measure the efficiency of aIV steps of the <br />' sample preparation and analytical method in recovering target analytes from <br />the sample matrix <br /> . <br /> It is assumed that the non-target surrogate compounds behave identically <br />' to the target analytes in the method. <br />' Field Sample Spikes <br /> <br />