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+\name{SFORB.solution}
+\Rdversion{1.1}
+\alias{SFORB.solution}
+\title{ Single First-Order Reversible Binding kinetics }
+\description{
+  Function describing the solution of the differential equations describing
+  the kinetic model with first-order terms for a two-way transfer from a free
+  to a bound fraction, and a first-order degradation term for the free
+  fraction.  The initial condition is a defined amount in the free fraction and
+  no substance in the bound fraction.
+}
+\usage{
+  SFORB.solution(t, parent.0, k_12, k_21, k_1output)
+}
+\arguments{
+  \item{t}{ Time. }
+  \item{parent.0}{ Starting value for the response variable at time zero. }
+  \item{k_12}{ Kinetic constant describing transfer from free to bound. }
+  \item{k_21}{ Kinetic constant describing transfer from bound to free. }
+  \item{k_1output}{ Kinetic constant describing degradation of the free fraction. }
+}
+\value{
+  The value of the response variable, which is the sum of free and bound 
+  fractions at time \code{t}.
+}
+\references{ 
+  FOCUS (2006) \dQuote{Guidance Document on Estimating Persistence and
+  Degradation Kinetics from Environmental Fate Studies on Pesticides in EU
+  Registration} Report of the FOCUS Work Group on Degradation Kinetics,
+  EC Document Reference Sanco/10058/2005 version 2.0, 434 pp,
+  \url{http://focus.jrc.ec.europa.eu/dk} 
+}
+\examples{
+  \dontrun{plot(function(x) SFORB.solution(x, 100, 0.5, 2, 3), 0, 2)}
+}
+\keyword{ manip }