S-Risk 1.3.3


S-Risk 1.3.3 will be released on March 28, 2022. This release contains the same changes as announced for version 1.3.2, but includes additional fixes for the technical issues we encountered when releasing 1.3.2.

This is a bugfix release with corrections for a few bugs that have recently been uncovered, both in the simulation model as well as the web application.

Model fixes

→ Fix for Kd formule for copper

For a number of inorganic substances, the kd factor is calculated based on the formula shown in Eq. 1 of the technical guidance. This also happens for copper, but it turns out that the parameter values used in the S-Risk model were incorrect.

We have investigated the impact of this bug by re-calculating all recent (i.e., non-archived) simulations involving copper available in the S-Risk database. 
The differences in resulting RI and CI values turn out to be very small (e.g., < 0.009 for “Overall RI”), and we have not found any simulations in which the overall conclusions have changed (i.e., RI<1 to RI>1 or vice versa).

→ Fix for user-provided egg concentrations

It has turned out that S-Risk does not take into account user-provided egg concentrations (see “Concentrations” tab > Tier 2 > “Animal products” button). In case the user provides an actuall egg concentration value, S-Risk will still rely on the BTF-calculated concentration instead of the provided value.

We have investigated the impact of this issue by looking up all recent (i.e., non-archived) simulations with user-provided egg concentrations in the S-Risk database. We have found no user simulations in our database that provide their own egg concentration measurements.

→ Fix for DFgw

DFgw is the dilution factor from pore water to groundwater, and is described in section 4.2 of the S-Risk Technical Guidance Document. In very rare, hypothetical situations, the DFgw value could drop below 1.0 and result in groundwater concentrations higher than the pore water concentrations via Equation 21. This concerns hypothetical calculations with extreme values of other parameters, which do not reflect realistic situations.

The model has now been adjusted to constrain the value of DFgw to be bigger than 1.0, so this situation can not occur anymore.

Web application fixes

  • made the login page look great again
  • the validation of parameter values (when saving or switching tabs) now runs in its own process, to keep the web interface as responsive as possible
  • fix to allow user-provided plant concentrations to be removed again in model configuration dialogs
  • ... and some minor bug fixes

Contact us via info@s-risk.be if you have further questions!