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Published byJuan Calhoun Modified over 3 years ago

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Introduction to ModelMaker Sabine Beulke, CSL, York, UK FOCUS Work Group on Degradation Kinetics Estimating Persistence and Degradation Kinetics from Environmental Fate Studies in EU Registration Brussels, 26-27 January 2005

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Curve fitting with ModelMaker

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Model construction

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Compartment Flow Model components Part of the system with defined boundaries which can store the quantity of interest (e.g. a pesticide) Represents the movement of the quantity from one compartment to another Parent in soil Metabolite in soil Parent Metabolite Change of quantity in compartment with time dCompartment / dt = + Flows in - Flows out Variable Quantity which is a function of other model components or a function of an independent variable (e.g. time) DT50 as a function of other model parameters

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For each compartment, the starting point (quantity present at the beginning of the simulation) must be defined Parent: 100% applied radioactivity Metabolite: zero Parameters are constants which do not change during the simulation k parent degradation rate constant for the parent in soil M 0 initial amount of the parent compound ffM formation fraction Initial conditions and parameters

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ModelMaker toolbar run model create graph create table add and define parameters compartmentflow optimise model variable

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