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Field Blank - A blank sample prepared in the field or carried to the sample site, exposed to sampling conditions (e.g. by removing bottle caps), and returned to a laboratory to be analyzed in the same manner in which environmental samples are being analyzed. Field blanks are used to identify the presence of any contamination that may have been added during the sampling and analysis process.
COC - Chain of Custody
EDD - Electronic Data Deliverable
Analytical Method - a procedure or technique for systematically performing an activity.
Surrogate - An organic compound used in the analyses of organic target analytes that is similar in composition and behavior to the target analytes but is not normally found in field samples. They are normally spikes of brominated or deuterated compounds incorporated into samples for organic analyses. Surrogates are added to every blank and spike sample to evaluate the efficiency with which analytes are being recovered during extraction and analysis. Surrogates are used to monitor the performance of the analytical process; the recovery of the surrogate compounds is used as a measure of accuracy and to judge the effect of sample matrix on the recovery of target analytes. Surrogates also may be called "system monitoring compounds"
Spike - A known amount of analyte that is introduced purposely into a sample (either an environmental sample or a blank) for the purpose of determining whether the analytical system can accurately measure the analyte.
Target Analyte - A chemical or parameter, the concentration, mass, or magnitude, of which is designed to be quantified by a particular test method.
Analyte - The element, nuclide, or ion a chemical analysis seeks to identify and/or quantify; the chemical constituent of interest.
Method Blank - An analyte-free matrix to which all reagents are added in the same volumes or proportions as those used in the environmental sample processing, and which is prepared and analyzed in the same manner as the corresponding environmental samples. Method blanks are used to assess whether contamination of a positive bias has been imparted to the results through the analytical procedures, ie, preparations and analysis or materials used by the laboratory. Method blanks are also referred to as analytical blanks or preparation blanks,
Field Duplicate Sample - Two separate, independent samples taken from the same source, which are collected as collected samples (i.e. equally representative of a sample matrix at a given location and time.)
Lab Matrix - The substrate that contains the analyte of interest (e.g. surface water, drinking water, air, soil, or tissue) for any given laboratory.