Calculate predicted environmental concentrations in soil

This is a basic calculation of a contaminant concentration in bulk soil based on complete, instantaneous mixing. If an interval is given, an attempt is made at calculating a long term maximum concentration using @@ -51,7 +58,8 @@ the concepts layed out in the PPR panel opinion (EFSA PPR panel 2012 and in the EFSA guidance on PEC soil calculations (EFSA, 2015, 2017).

Usage

PEC_soil(
   rate,
   rate_units = "g/ha",
@@ -78,8 +86,8 @@ and in the EFSA guidance on PEC soil calculations (EFSA, 2015, 2017).
 )

Arguments

rate: Application rate in units specified below

Value

The predicted concentration in soil

Details

This assumes that the complete load to soil during the time specified by 'interval' (typically 365 days) is dosed at once. As in the PPR panel opinion cited below (EFSA PPR panel 2012), only temperature correction using the @@ -210,8 +218,8 @@ Arrhenius equation is performed.

Total soil and porewater PEC values for the scenarios as defined in the EFSA guidance (2017, p. 14/15) can easily be calculated.

Note

While time weighted average (TWA) concentrations given in the examples from the EFSA guidance from 2015 (p. 80) are be reproduced, this is not true for the TWA concentrations given for the same example in the EFSA guidance @@ -227,8 +235,8 @@ from 2017 (p. 92).

(destination 'PECgw') is taken from the chent object, otherwise the DT50 with destination 'PECsoil'.

References

EFSA Panel on Plant Protection Products and their Residues (2012) Scientific Opinion on the science behind the guidance for scenario selection and scenario parameterisation for predicting environmental @@ -245,13 +253,13 @@ from 2017 (p. 92).

in soil. EFSA Journal 13(4) 4093 doi:10.2903/j.efsa.2015.4093

Author

Johannes Ranke

Examples

PEC_soil(100, interception = 0.25)
 #>      scenario
 #> t_avg default
@@ -297,26 +305,22 @@ from 2017 (p. 92).
                            Kom = 100, scenarios = "EFSA_2015", porewater = TRUE)

- -