Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Limits of Uncertainty of Environmental Measurements. (Using as an Example, the Dichotomous Particulate Sampler).
Author Rhodes, R. C. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher Feb 90
Year Published 1990
Report Number EPA/600/D-90/014;
Stock Number PB90-200734
Additional Subjects Limits(Mathematics) ; Environmental surveys ; Measuring instruments ; Formulas(Mathematics) ; Comparison ; Air flow ; Error analysis ; Graphs(Charts) ; Measurement ; Bias ; Accuracy ;
Library Call Number Additional Info Location Last
NTIS  PB90-200734 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 08/27/1990
Collation 22p
Two different methods are used to determine the limits of uncertainty for environmental measurements. The first employs the general propagation of error formula. In this method, the precisions and accuracies of each of the variables of the mathematical expression defining the final measurement result are used. A second method utilizes the agreement of results from co-located samplers to estimate precision and results of independent audits to estimate bias. Each of the methods has certain advantages. The end results, using the dichotomous particulate sampler as an example, show that the use of co-located samplers reveals the presence of unaccounted for sources of error not considered by the method using the propagation of error formula.