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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

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Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Description of key information

The performance of an adsorption /desorption study with tantalum pentachloride is technically not feasible. 

Key value for chemical safety assessment

Additional information

The test substance tantalum pentachloride readily decomposes after contact with water as demonstrated by the results of the available hydrolysis study (Kuhlmann, 2014). The decomposition is accompanied by a strong temperature rise and a strong shift in pH (<1). Slight changes in pH have profound impact on the test concentration of soluble Ta5+. It is not possible to adjust stable and predictable Ta5+solution concentrations which is the prerequisite for any batch/equilibrium experiment investigating the adsorption/desorption behaviour of Ta5+. Thus, the performance of an adsorption/desorption study is technically not feasible.