Registration Dossier
Registration Dossier
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EC number: 209-676-3 | CAS number: 590-28-3
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.018 mg/L
- Assessment factor:
- 1 000
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 0.18 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.002 mg/L
- Assessment factor:
- 10 000
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 100 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 0.091 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.009 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 0.008 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- PNEC oral
- PNEC value:
- 66.67 mg/kg food
- Assessment factor:
- 30
Additional information
PNECs were derived from the most sensitive test available for each compartment/endpoint.
Conclusion on classification
Acute toxicity:
Daphnia magna is the most sensitive species with a EC50 value of 18 mg/L. According to Regulation (EC) No 1272/2008 (CLP, GHS) potassium cyanate has not to be classified regarding acute toxicity to the environment as the lowest LD50 value is above 1 mg/L.
Chronic toxicity:
Daphnia magna is the most sensitive species in chronic studies with a EC10 value of 0.2 mg/L. As chronic data from algae and daphnia are available the classification is based on these chronic data and represents worst case assumption as compared with a C+L derivation based on acute values.
The test on ready biodegradability is technically not feasible (see section 5.2.1). Nevertheless, within the aborted study, a significant reduction of the TOC was observed after three hours. Without much doubt the cyanate was degraded by abiotic processes and decomposed to CO2 and NH3. This is well supported by respective hydrolysis studies. With regard to classification cyanate is thus regarded as degradable in nature and has in conclusion to be classified as env. chronic tox. cat 3, H412 according to Regulation (EC) No 1272/2008 (CLP/GHS), as amended for the seventeenth time in Regulation (EU) 2021/849, based on the chronic test data.
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