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Environmental fate & pathways

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The substance has a very low vapour pressure, and does not sublime. Therefore, the substance will not be present as a gas and no radical reactions can be expected. According to its chemical properties, hydrolysis is not expected/probable. Photodegradation in water is not relevant because it dissociates rapidly into ions.

Degradation/biodegradation testing is not relevant for metals and metal compounds like tin bis(tetrafluoroborate), which are considered as not (bio)degradable. Therefore, the chemical assessment of tin bis(tetrafluoroborate) is based on the total initial tin concentration, which can be considered as a worst-case assumption.

Estimated bioconcentration factors of inorganic tin were 100, 1000, and 3000 for marine and freshwater plants, invertebrates, and fish, respectively (Thompson et al., 1972). Marine macroalgae may bioconcentrate the Sn4+ ion by a factor of 1900 (Seidel et al., 1980). Donard et al. (1987) reported inorganic tin concentrations of up to 4.4 mg/kg dry weight in macroalgae. Tin-resistant bacteria contained tin at 3.7–7.7 g/kg dry weight (Maguire et al., 1984). There is no information available on the potential transfer of inorganic tin compounds from lower trophic levels to higher levels.