Which parameters do I have to provide when adding a new chemical?

You can add a new chemical by selecting and adding "(Blank chemical)" from the drop-down menu on the Chemical tab. Afterwards, under Tier 2, you have to fill in various chemical related parameters on the following tabs:

  • Chemical tab: Physico-chemical property data.
    Depending on the type of chemical (i.e., inorganic or organic), other parameters may be required.
  • Plants tab: Volumetric washout factor for particles, metabolization rate, photodegradation rate and transfer factors for vegetables and animal feed plants.
    These parameters should only be provided when you have selected at least one of the following exposure pathways on the Scenario tab: intake via locally produced vegetables, meat and milk or eggs. Default values are provided for the volumetric washout factor for particles, the metabolization rate and photodegradation rate. In case of an organic chemical, the transfer factors for vegetables and animal feed plants can also be calculated by the model.
  • Animals tab: Transfer factors to animal products.
    These factors should only be filled out when you have selected at least one of the following exposure pathways on the Scenario tab: intake via locally produced meat and milk or eggs. In case of an organic chemical, the transfer factors to meat and dairy products can also be calculated by the model.
  • Concentrations tab: Just as for built-in chemicals, you have to provide concentrations of the new chemical in all added soil layers and in groundwater (if this option is chosen on the Water tab). If relevant, pathway specific soil concentrations can also be filled in as well as concentrations in transfer media and animal related (background) concentrations.
  • Exposure tab: Background exposure via food, relative bioavailabilities, age specific weight factors, dermal exposure parameters and background concentrations.
    Default values are foreseen for the relative bioavailabilities and the age specific weight factors. Background exposure and concentration data need to be provided in case of a chemical with threshold effects (i.e., for which the risk is calculated using a TDI approach). Furthermore, the background concentrations in plants and animal products are only of significance in case you have a scenario with consumption of local food. In case of an organic chemical, dermal absorption from water can also be calculated by the model.
  • Risk tab: Toxicological reference values.
    Depending on the type of chemical (i.e., with threshold, non-threshold or pseudo-threshold effects), other parameters may be required.
  • Concentration limits tab: (Legal) concentration limits for transfer media.

The user manual (EN / NL) provides more information on how to fill in these fields.
last modified on 01/12/2016 - 09:28

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