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authorJohannes Ranke <jranke@uni-bremen.de>2016-09-27 23:00:48 +0200
committerJohannes Ranke <jranke@uni-bremen.de>2016-09-27 23:00:48 +0200
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-% Generated by roxygen2: do not edit by hand
-% Please edit documentation in R/GUS.R
-\name{GUS}
-\alias{GUS}
-\alias{GUS.chent}
-\alias{GUS.numeric}
-\alias{print.GUS_result}
-\title{Groundwater ubiquity score based on Gustafson (1989)}
-\usage{
-GUS(...)
-
-\method{GUS}{numeric}(DT50, Koc, ...)
-
-\method{GUS}{chent}(chent, degradation_value = "DT50ref",
- lab_field = "laboratory", redox = "aerobic", sorption_value = "Kfoc",
- degradation_aggregator = geomean, sorption_aggregator = geomean, ...)
-
-\method{print}{GUS_result}(x, ..., digits = 1)
-}
-\arguments{
-\item{...}{Included in the generic to allow for further arguments later. Therefore
-this also had to be added to the specific methods.}
-
-\item{DT50}{Half-life of the chemical in soil. Should be a field
-half-life according to Gustafson (1989). However, leaching to the sub-soil
-can not completely be excluded in field dissipation experiments and Gustafson
-did not refer to any normalisation procedure, but says the field study should
-be conducted under use conditions.}
-
-\item{Koc}{The sorption constant normalised to organic carbon. Gustafson
-does not mention the nonlinearity of the sorption constant commonly
-found and usually described by Freundlich sorption, therefore it is
-unclear at which reference concentration the Koc should be observed
-(and if the reference concentration would be in soil or in porewater).}
-
-\item{chent}{If a chent is given with appropriate information present in its
-chyaml field, this information is used, with defaults specified below.}
-
-\item{degradation_value}{Which of the available degradation values should
-be used?}
-
-\item{lab_field}{Should laboratory or field half-lives be used? This
-defaults to lab in this implementation, in order to avoid
-double-accounting for mobility. If comparability with the original GUS
-values given by Gustafson (1989) is desired, non-normalised first-order
-field half-lives obtained under actual use conditions should be used.}
-
-\item{redox}{Aerobic or anaerobic degradation data}
-
-\item{sorption_value}{Which of the available sorption values should be used?
-Defaults to Kfoc as this is what is generally available from the European
-pesticide peer review process. These values generally use a reference
-concentration of 1 mg/L in porewater, that means they would be expected to
-be Koc values at a concentration of 1 mg/L in the water phase.}
-
-\item{degradation_aggregator}{Function for aggregating half-lives}
-
-\item{sorption_aggregator}{Function for aggregation Koc values}
-
-\item{x}{An object of class GUS_result to be printed}
-
-\item{digits}{The number of digits used in the print method}
-}
-\value{
-A list with the DT50 and Koc used as well as the resulting score
- of class GUS_result
-}
-\description{
-The groundwater ubiquity score GUS is calculated according to
-the following equation
-\deqn{GUS = \log_{10} DT50_{soil} (4 - \log_{10} K_{oc})}{GUS = log10 DT50soil * (4 - log10 Koc)}
-}
-\author{
-Johannes Ranke
-}
-\references{
-Gustafson, David I. (1989) Groundwater ubiquity score: a simple
-method for assessing pesticide leachability. \emph{Environmental
-toxicology and chemistry} \bold{8}(4) 339–57.
-}
-

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