+ kvolatilization + krunoff + kleaching Kfield = Σ ( kmetabolism + kphotolysis +…..kx). Ideally, the field rate of dissipation would be equal to the sum of the important dissipation rates identified from the laboratory fate studies. To determine whether the field study result is consistent with the conceptual model proposed rate, the EFED scientist should calculate the rate of dissipation from the original compartment (e.g., the top X inch(es) of soil) using the latest guidance on degradation kinetics. This field rate should be compared to the sum of the rates from the laboratory fate studies for important processes in the conceptual model. Adsorption and desorption properties of the test substance from batch equilibrium studies should also be considered in characterizing the field dissipation from the test plot.] Table 1. Dissipation Synopsis Maximum Concentrations (lb/A) in Media Test System Major Dissipation Route (cm soil, ft water, or cm air), at Time Period (days after application) [Soil Location] [list concentrations, depths/heights in media, and [USGS Soil Series] [Biodegradation] time periods of measurement for all measured [Soil Texture] constituents] [pH #] [Soil Location] [list concentrations, depths/heights in media, and [USGS Soil Series] [Biodegradation] time periods of measurement for all measured [Soil Texture] constituents] [pH #] Table 2. Results Synopsis Calculated Observed Total Field Total Model Transformation Products Dissipation Field Parameters Common Name (maximum % of nominal Half-life DT50 and Statistics application, associated interval) (days) (days) Method [Soil Location] [USGS Soil Series] [value] [value] [values] [name] (#%, # d) [Soil Texture] [method] [pH #] [Soil Location] [USGS Soil Series] [value] [value] [values] [name] (#%, # d) [Soil Texture] [method] [pH #] [Add on to tables as necessary for different locations, plots, or applications. Model parameters include model variables, Sc values, and correlation coefficients.]
Kfield = Σ ( kmetabolism + kphotolysis + kvolatilization + krunoff + kleaching +…..kx). Ideally, the field rate of dissipation would be equal to the sum of the important dissipation rates identified from the laboratory fate studies. To determine whether the field study result is consistent with the conceptual model proposed rate, the EFED scientist should calculate the rate of dissipation from the original compartment (e.g., the top X inch(es) of soil) using the latest guidance on degradation kinetics. This field rate should be compared to the sum of the rates from the laboratory fate studies for important processes in the conceptual model. Adsorption and desorption properties of the test substance from batch equilibrium studies should also be considered in characterizing the field dissipation from the test plot.] Table 1. Dissipation Synopsis Test System Major Dissipation Route Maximum Concentrations (lb/A) in Media (cm soil, ft water, or cm air), at Time Period (days after application) [Soil Location] [USGS Soil Series] [Soil Texture] [pH #] [Biodegradation] [list concentrations, depths/heights in media, and time periods of measurement for all measured constituents] [Soil Location] [USGS Soil Series] [Soil Texture] [pH #] [Biodegradation] [list concentrations, depths/heights in media, and time periods of measurement for all measured constituents] Table 2. Results Synopsis Observed Total Field DT50 (days) Calculated Total Field Dissipation Half-life (days) Method Model Parameters and Statistics Transformation Products Common Name (maximum % of nominal application, associated interval) [Soil Location] [USGS Soil Series] [Soil Texture] [pH #] [value] [value] [method] [values] [name] (#%, # d) [Soil Location] [USGS Soil Series] [Soil Texture] [pH #] [value] [value] [method] [values] [name] (#%, # d) [Add on to tables as necessary for different locations, plots, or applications. Model parameters include model variables, Sc values, and correlation coefficients.]
field-dissipation-835-6100-6200-may2012.docx