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A Mixed-Order Model to Assess Contaminant Declines
Authors:Craig A Stow  Leland J Jackson  S R Carpenter
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
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.
Keywords:BOD  mixed-order model
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