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Environmental fate & pathways

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Data are not available to allow the distribution of dibutyltin methyl maleate within the environment to be modelled. The performance of an adsorption/desorption study is not feasible based on the properties of the compound. In addition water solubility and LogPow values are not available as the performance of these studies is also technically not feasible. In the water solubility study dibutyltin methyl maleate undergoes immediate hydrolysis to a greasy white precipitate which is concluded to be the insoluble hydrolysis product DBTO (dibutyltin oxide). Based on the known behaviour of similar compounds, dibutyl tin methyl maleate will be insoluble in water and will be primarily associated with soils and sediment. For the purpose of risk assessment a solubility of 1 mg/L (a default value chosen based on its low solubility) and a Koc of 2000 ml/g have been used to model the behaviour of dibutyltin methyl maleate in the environment.