In the NAFTA regulatory community, a currently consistent methodology used to estimate dissipation times for environmental fate data has not applied. This work demonstrates through a case study that the inappropriate use of pseudo-first-order regression models can result in inaccurate estimates of degradation rates, and it proposes some statistical tools that can be used to identify an appropriate statistical model to fit a particular environmental fate dataset. Diagnostic procedures are proposed to identify the appropriate scale, and statistical testing procedures used to select an appropriate model within that scale. Results from this work demonstrate that, unless appropriate diagnostic and statistical procedures are used, inaccurate estimates of dissipation times may result.

Statistical means for proper determination of kinetic half-lives

246th National Meeting (2013)

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