Registration Dossier
Registration Dossier
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EC number: 200-816-9 | CAS number: 74-86-2
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- no hazard identified
Marine water
- Hazard assessment conclusion:
- no hazard identified
STP
- Hazard assessment conclusion:
- no hazard identified
Sediment (freshwater)
- Hazard assessment conclusion:
- no hazard identified
Sediment (marine water)
- Hazard assessment conclusion:
- no hazard identified
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- no hazard identified
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
Substance is a gas and is extremely unlikely to reside in the aquatic or terrestrial compartment. Deriving a PNEC for a gas is unreasonable and technically of little use for risk assessment as the substance will not be present in the aquatic or terrestrial environment.
Conclusion on classification
The lowest calculated acute result was a 96 hr EC50 for green algae of 57 mg/L. A log Kow of 0.37 for acetylene indicates the potential for bioaccumulation to be low. Measured data are not available to demonstrate that acetylene is readily biodegradable, but it is expected to partition to the air from water, reducing the potential for exposure. Volatilisation from surface waters will predictably be rapid: Henry's Law constant indicates that the volatilisation half life will be <6 days in a water body up to10 metres deep. EPISuite QSAR model predicts half-lives of 32 minutes and 49 hours in rivers and lakes respectively (1m depth, wind velocity 5 and 0.5 m/sec respectively). If released into surface waters, volatilisation will therefore ensure rapid removal of acetylene into the atmospheric compartment. Furthermore, based on Pedersen et al (1995) this rate of volatilisation is equivalent to a substance being readily biodegradable. On these grounds, classification for aquatic toxicity is not considered to be warranted
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