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#' Determine the SSLRC mobility classification for a chemical substance from its Koc
#'
#' This implements the method specified in the UK data requirements handbook and was
#' checked against the spreadsheet published on the CRD website
#'
#' @param Koc The sorption coefficient normalised to organic carbon in L/kg
#' @return A list containing the classification and the percentage of the
#' compound transported per 10 mm drain water
#' @references HSE's Chemicals Regulation Division (CRD) Active substance
#' PECsw calculations (for UK specific authorisation requests)
#' \url{https://www.hse.gov.uk/pesticides/topics/pesticide-approvals/pesticides-registration/data-requirements-handbook/fate/active-substance-uk.htm}
#' accessed 2019-09-27
#'
#' Drainage PECs Version 1.0 (2015) Spreadsheet published at
#' \url{https://www.hse.gov.uk/pesticides/topics/pesticide-approvals/pesticides-registration/data-requirements-handbook/fate/pec-tools-2015/PEC\%20sw-sed\%20(drainage).xlsx}
#' accessed 2019-09-27
#' @export
#' @author Johannes Ranke
#' @examples
#' SSLRC_mobility_classification(100)
#' SSLRC_mobility_classification(10000)
SSLRC_mobility_classification <- function(Koc)
{
if (!is.numeric(Koc) | length(Koc) != 1) stop("Please give a single number")
if (is.na(Koc)) {
result <- list(NA, NA)
} else {
result <- list("Non mobile", 0.008)
if (Koc < 4000) result <- list("Slightly mobile", 0.02)
if (Koc < 1000) result <- list("Slightly mobile", 0.5)
if (Koc < 500) result <- list("Moderately mobile", 0.7)
if (Koc < 75) result <- list("Mobile", 1.9)
if (Koc < 15) result <- list("Very mobile", 1.9)
}
names(result) <- c("Mobility classification",
"Percentage drained per mm of drain water")
return(result)
}
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