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Sediment toxicity

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Experimental data on the toxicity of chloroethane (CAS 75-00-3) to sediment organisms are not available. The substance is a gas and thus will mainly distribute to the air when released to the environment. Though the water solubility of chloroethane is relatively high (WS: 5.74 g/L at 20°C) an accumulation in aqueous compartments is not likely. The substance will rapidly evaporate from the water surface   due to its high vapour pressure of 134200 Pa at 20 °C (62330 Pa at 0 °C). This is also indicated by the calculated Henry's Law constant of 1124.70 Pa m³/mol (Gossett, 1987). Furthermore chloroethane will not adsorp to organic matter or suspended particles (log Koc <3). Considering the physico-chemical properties of chloroethane a very low bioavailability for sediment organisms can be assumed. The substance is presumably not present in the water phase, or only at very limited concentrations. Furthermore uptake via ingestion of suspended matter is unlikely. The substance is furthermore characterised by a very low bioaccumulation potential as indicated by the calculated BCF/BAF values of 3.43 L/kg. Consequently the risk of toxic effects of the substance to sediment organisms is deemed negligible.

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