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FIELD DUPLICATES: Independent samples which are collected as close as <br /> possible to the same point in space and time. They are <br /> two separate samples taken from the same source, stored in <br /> separate containers, and analyzed independently. These <br /> duplicates are useful in documenting the precision of the, <br /> sampling process. <br /> LABORATORY CONTROL A known matrix spiked with compound(s) representative of <br /> SAMPLE: the target analytes. This is used to document laboratory <br /> performance. <br /> MATRIX: The component or substrate (e.g. , surface water, drinking <br /> water) which contains the analyte of interest. <br /> MATRIX DUPLICATE: An intralaboratory split sample which is used to document <br /> the precision of a method in a given sample matrix. <br /> MATRIX SPIKE: An aliquot of sample spiked with a known concentration of <br /> target analyte(s) . The spiking occurs prior to sample <br /> preparation and analysis. A matrix spike is used to <br /> document the bias of a method in a given sample matrix. <br /> MATRIX SPIKE Intralaboratory split samples spiked with identical <br /> DUPLICATES: concentrations of target analyte(s) . The spiking occurs <br /> prior to sample preparation and analysis. They are used <br /> to document the precision and bias of a method in a given <br /> sample matrix. <br /> METHOD BLANK: An analyte-free matrix to which all reagents are added in <br /> the same volumes or proportions as used in sample <br /> processing. The method blank should be carried through <br /> the complete sample preparation and analytical procedure. <br /> The method blank is used to document contamination <br /> resulting from the analytical process. <br /> For a method blank to be acceptable for use with the <br /> accompanying samples, the concentration in the blank of <br /> any analyte of concern should not be higher than the <br /> highest of either: <br /> (1)The method detection limit, or <br /> (2)Five percent of the regulatory limit for that analyte, <br /> or <br /> (3)Five percent of the measured concentration in the <br /> sample. <br /> METHOD DETECTION The minimum concentration of a substance that can be <br /> LIMIT (MDL) : measured and reported with 99% confidence that the analyte <br /> concentration is greater than zero and is determined from <br /> ONE - 25 Revision 1 <br /> July 1992 <br />