A Mixed-Order Model to Assess Contaminant Declines |
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Authors: | Craig A Stow Leland J Jackson S R Carpenter |
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Institution: | (1) Duke University, Nicholas School of the Environment, Box 90328, Durham, NC, 27708, U.S.A;(2) Department of Biological Sciences, Division of Ecology, University of Calgary, Calgary, Alberta, Canada;(3) Center for Limnology, University of Wisconsin, Madison, Wisconsin, U.S.A |
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Abstract: | We introduce a generalized form of the common first-order (exponential) decay model, that has potential utility for describing contaminant declines in environmental applications, particularly when declines are a mixture of many underlying processes. The exponent on contaminant concentration is left as a free parameter allowing the order of the reaction to be determined by the data. The mixed-order model is more flexible than models with the exponent determined a priori, facilitating an improved fit to observed behavior. We demonstrate the utility of this model, and compare it to two other models, by estimating PCB concentration declines in Lake Michigan fishes. |
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Keywords: | BOD mixed-order model |
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