Evaluation of Three Measures of Exposure Concentration: A Case Study of Surface Sediment Concentrations in the Passaic River

Autor:	Paul Scott, David E. Rabbe, Elizabeth W. Liebig, Brent L. Finley
Rok vydání:	2000
Předmět:	Human health CLs upper limits Health Toxicology and Mutagenesis Ecological Modeling Statistics Environmental engineering Environmental science Ecological risk Risk assessment Pollution Weighted arithmetic mean Spatial analysis Arithmetic mean
Zdroj:	Human and Ecological Risk Assessment: An International Journal. 6:511-528
ISSN:	1549-7860 1080-7039
DOI:	10.1080/10807030091124590
Popis:	Arithmetic and lognormal means historically have been used as estimates of exposure concentration for both human health and ecological risk assessment. Past risk assessment guidance has emphasized the need to include all available informa tion, particularly regarding the spatial and temporal aspects of data and exposure. One estimate of exposure concentration that includes spatial information is the 95% upper confidence limit (UCL) of the area weighted mean. An area weighted mean is calculated using weightings based on the ratio of the area associated with a sample location and the total area of the study area. Currently, U.S. Environmental Protection Agency (USEPA) risk assessment guidance recommends the use of the 95% UCL of the arithmetic mean as the most appropriate measure of exposure concentration for soil and sediment in human health and ecological risk assess ments. The purpose of this study was two fold: (1) to evaluate the use of the 95% UCL of the area weighted mean vs. the 95% UCL of the arith...
Databáze:	OpenAIRE
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