This implements the method specified in the UK data requirements handbook and was checked against the spreadsheet published on the CRC website

PEC_sw_drainage_UK(rate, interception = 0, Koc,
  latest_application = NULL, soil_DT50 = NULL, model = NULL,
  model_parms = NULL)

Arguments

rate

Application rate in g/ha

interception

The fraction of the application rate that does not reach the soil

Koc

The sorption coefficient normalised to organic carbon in L/kg

latest_application

Latest application date, formatted as e.g. "01 July"

soil_DT50

Soil degradation half-life, if SFO kinetics are to be used

model

The soil degradation model to be used. Either one of "FOMC", "DFOP", "HS", or "IORE", or an mkinmod object

model_parms

A named numeric vector containing the model parameters

Value

The predicted concentration in surface water in µg/L

References

HSE's Chemicals Regulation Division (CRD) Active substance PECsw calculations (for UK specific authorisation requests) 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 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

Examples

PEC_sw_drainage_UK(150, Koc = 100)
#> [1] 8.076923