Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Being an inorganic metal, tin released to the environment is not degraded or destroyed but may only change its form (i.e., oxidation state, associated anions or ligands).

Atmospheric compartment

The vapour pressure of elemental tin is negligible, and the high boiling point of elemental tin indicates that it is non-volatile under environmental conditions. Atmospheric concentrations of inorganic tin are therefore considered to be of no significance.

Aquatic compartment

Tin is generally regarded as being relatively immobile in the environment due to its extremely low solubility (0.004mg/l in water). However, tin may be transported in water if it partitions to suspended sediments. The significance of this mechanism has not been studied in detail, however as the Log Kd of tin is 2.1 - 4.3 L/kg and distribution via this route is considered to be insignificant.

Terrestrial compartment

Almost no information is found regarding the forms of inorganic tin in soil or reactions with tin compounds in soil. There are also data gaps with regard to studies that investigate the relationship between soil properties (organic matter content, clay content) and adsorption of tin to soil particles. Based upon the available data the rate of adsorption is expected to be linked to active-Fe and -Al content of soils and it is thereofore expected that tin will bind to clay and other minerals in soil. Distribution throughout the terrestrial compartment is considered to be insignificant as tin is unlikely to form leachates due to the low water solubility of the substance.