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EC number: 204-707-7 | CAS number: 124-64-1
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
Description of key information
The results of the water/sediment simulation study in aerobic conditions show that THPS is readily biodegradable in both freshwater and
open sea water. The read across with THPS is considered as relevant and THPC should be readily biodegradable too.
Key value for chemical safety assessment
- Half-life in freshwater:
- 2 d
- at the temperature of:
- 25 °C
- Half-life in freshwater sediment:
- 14 d
- at the temperature of:
- 25 °C
Additional information
- The pass level of 60 % biodegradation expressed as %CO2evolved was reached within 10 days.
- THPS was not detected in any of the water layer samples. The major degradation product THPO was only detected at a level > 10 % in the day 0 water layer sample.
- A mineralisation half-life of 2 days based on CO2evolution at 25°C can be estimated.
- Biodegradation in surface water: using the Arrhenius equation, a mineralisation half-life of 5.7 days at 12°C can be calculated for the freshwater environment according to the EU TGD (2003). This mineralisation half-life is lower than the default half-life of 15 days for freshwater as defined in the EU TGD for readily biodegradable substances.
- Biodegradation in open sea: a mineralisation half-life of 17 days can be calculated for open sea by applying a factor of 3 (EU TGD, 2003). This mineralisation half-life is lower than the default half-life of 50 days for open sea as defined in the EU TGD for readily biodegradable substances.
The results of the water/sediment simulation study in anaerobic conditions show that THPS is readily biodegradable in anaerobic environments. Approximately 60 % of the test substance was mineralised within 30 days, and mineralisation was greater than 80 % by one year. From the % CO2evolution curve, a rough half-life of 14 days at 25 °C has been estimated for risk assessment purposes.
Because of the salt nature of THPC, hazard properties of chloride salt could be predicted to be equivalent to hazard properties of the sulphate salt (THPS). The read across with a similar substance as THPS is then considered as relevant.
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