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EVALUATION OF ANALYTICAL REPORTING ERRORS GENERATED AS DESCRIBED IN SW-846 METHOD 8261A
Citation:
HIATT, M. H. EVALUATION OF ANALYTICAL REPORTING ERRORS GENERATED AS DESCRIBED IN SW-846 METHOD 8261A. AMERICAN CHEMICAL SOCIETY. Springer-Verlag, Berlin, Germany, 13(4-5):247-254, (2008).
Impact/Purpose:
Land Preservation and Restoration - by providing state-of-the-science chemical methods (encompassing sampling, preparation, separation, detection, and interpretation) to allow rapid and accurate field and laboratory analyses of contaminated soils, sediments, biota, and groundwater to support Superfund and hazardous waste clean-up decisions.
Description:
SW-846 Method 8261A incorporates the vacuum distillation of analytes from samples, and their recoveries are characterized by internal standards. The internal standards measure recoveries with confidence intervals as functions of physical properties. The frequency the calculated confidence intervals captured a known concentration was very close to theoretical predictions. The ruggedness of the Method's generation of confidence intervals was tested by analyzing water samples that were altered using salt, glycerin, oil, and detergent as well as increasing sample volume size. Quality control requirements were established for identifying when results might not be normally distributed. There were 11,260 analyte results, of which 90.8% of the data passed quality controls. Their distribution about true value was near theoretical values (71.3, 95.0, and 99.2% for one, two and three sigma deviations).