Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

The test substance rapidly decomposes in contact with water forming a range of breakdown products. The test substance can only be analysed after derivatisation, but using derivatisation, a distinction between intact test substance and breakdown products can no longer be made, this is a prerequisite for the hydrolysis study. In addition, the expected water solubility is very low and at these low levels it is often difficult if not impossible to prevent adsorption of test substance to the vials or containers used. In conclusion, the hydrolysis of the test substance could not be performed (Baltussen E (2010) Determination of Physico-Chemical Properties of Monobutyltin Trichloride. NOTOX project no. 492798).

Additional information

Until very recently, the substance was indeed considered to be highly insoluble in water and to hydrolyse rapidly and as such the statement above had been submitted. As part of the ongoing CoRAP evaluation additional investigations are currently being conducted and studies are still ongoing. Anecdotal evidence suggests that the substance may be more soluble than originally thought and has been shown not to rapidly hydrolyse. Work is currently ongoing to clarify the behaviour of the substance and once the appropriate data are available, the CSR and the corresponding Key Information will be updated accordingly once all the relevant information on the behavior of the substance in the environment including its water solubility and partition coefficient are available.