Q&As

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EUSES

Substance properties

Do I still need to set the value of the Henry's Law constant?
You can provide experimental values together with the temperature at which it was measured. Otherwise EUSES will use the Henry's law constant at 25 °C which is automatically calculated. In this respect nothing has changed compared to the previous version of EUSES.
Why can't I use the vapour pressure and the water solubility values which I determined at a temperature different from 20/25 °C?
Those fields were removed since the equations implemented in EUSES to calculate VP / water solubility at 25 °C from a measured VP (at a given temperature) were only applicable within a narrow temperature range. On the other hand, the water solubility is usually determined at 20 °C and the VP is usually determined at 20 °C for volatile substances as well.
Can I use the measured DT50 values to overwrite the degradation rate constant or the total rate constant?
Output or default values can always be overwritten in EUSES; this also applies to degradation rates. Measured DT 50 values can be used to overwrite the degradation rate constant.
Under what circumstances would a DT50 affect the PEC water?
It affects the PEC in water only in cases of direct release (e.g. in PT 8 bridge over pond scenario).