From a401a9225d212ed4dc64e96765f04aaaf17cc8c1 Mon Sep 17 00:00:00 2001 From: Johannes Ranke Date: Wed, 18 Sep 2019 13:23:23 +0200 Subject: Further corrections of the twa vignette Static documentation rebuilt by pkgdown --- vignettes/twa.html | 485 +++++++++++++++++------------------------------------ 1 file changed, 154 insertions(+), 331 deletions(-) (limited to 'vignettes/twa.html') diff --git a/vignettes/twa.html b/vignettes/twa.html index d8322bfc..0db7eeff 100644 --- a/vignettes/twa.html +++ b/vignettes/twa.html @@ -8,6 +8,7 @@ + @@ -15,349 +16,195 @@ Calculation of time weighted average concentrations with mkin - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - @@ -366,20 +213,12 @@ $(document).ready(function () { -
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Since version 0.9.45.1 of the ‘mkin’ package, a function for calculating time weighted average concentrations for decline kinetics (i.e. only for the compound applied in the experiment) is included. Strictly speaking, they are maximum moving window time weighted average concentrations, i.e. the maximum time weighted average concentration that can be found when moving a time window of a specified width over the decline curve.

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\[f_\textrm{twa} = \frac{1}{t} \left( \frac{1}{k_1} \left( 1 - e^{- k_1 t_b} \right) + \frac{e^{- k_1 t_b}}{k_2} \left( 1 - e^{- k_2 (t - t_b)} \right) \right) \]

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Note that a method for calculating maximum moving window time weighted average concentrations for any model fitted by ‘mkinfit’, and also for metabolites in such models, is integrated in the ‘mkin’ package, see the documentation at my website.

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Note that a method for calculating maximum moving window time weighted average concentrations for a model fitted by ‘mkinfit’ or from parent decline model parameters is included in the ‘max_twa_parent’ function. If the same is needed for metabolites, the function ‘max_twa’ from the ‘pfm’ package can be used.

FOCUS Work Group on Degradation Kinetics. 2014. Generic Guidance for Estimating Persistence and Degradation Kinetics from Environmental Fate Studies on Pesticides in Eu Registration. 1.1 ed. http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics.

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