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diff --git a/pkg/man/GUS.Rd b/pkg/man/GUS.Rd new file mode 100644 index 0000000..5e2c936 --- /dev/null +++ b/pkg/man/GUS.Rd @@ -0,0 +1,70 @@ +% 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} +\title{Groundwater ubiquity score based on Gustafson (1989)} +\usage{ +GUS(...) + +\method{GUS}{numeric}(DT50, Koc) + +\method{GUS}{chent}(chent, lab_field = "laboratory", aerobic = TRUE, + degradation_value = "DT50ref", sorption_value = "Kfoc", + degradation_aggregator = geomean, sorption_aggregator = geomean, + digits = 1) +} +\arguments{ +\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{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{degradation_value}{Which of the available degradation values should +be used?} + +\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} +} +\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. _Environmental +toxicology and chemistry_ *8*(4) 339–57. +} + |