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Environmental fate & pathways

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Acetylene is expected to partition to the air from water, reducing the potential for exposure. Volatilisation for surface waters will predictably be rapid: calculation based on Henry's Law constant indicates that the volatisation half life will be <6 days in a water body up to10 metres deep (PEDERSEN et al 1995) and similar calculations using the EPISuite v.4.0 model predicts (USEPA 2009) 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.