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Sediment toxicity

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Available information from public literature on effects of methanol on sediment organisms indicates very low  acute toxicity. Moreover, since the substance exhibits a low log Pow and low log Koc exposure of sediment organisms is unlikely and testing towards sediment dwelling organisms not necessary. The equilibrium partitioning method can be used for assessing the hazard of sediment organisms.

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Additional information

In Annex X of the Regulation (EC) No 1907/2006 REACH concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH), it is suggested, that "long-term toxicity testing shall be proposed by the registrant if the results of the chemical safety assessment indicates the need to investigate further the effects of the substance and/or relevant degradation products on sediment organisms. The choice of the appropriate test(s) depends on the results of the chemical safety assessment." Methanol has a low potential for adsorption or bioaccumulation, exhibits a very high solubility in water and is readily biodegradable in both aerobic and anaerobic environments. In addition, results from the aquatic studies indicate no harmful effects. Therefore exposure of sediment organisms is unlikely and testing towards sediment dwelling organisms not necessary. The expected low toxicity towards sediment organisms is underlined by the available studies of Tichy (2007) and Kaviraj (2004) where an EC50 of 71700 mg/L for Tubifex tubifex and a LC50 of 54890 mg/L were observed. Furthermore, the equilibrium partitioning method can be used for assessing the hazard of sediment organisms.