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Environmental fate & pathways

Hydrolysis

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Description of key information

Hydrolysis study does not need to be conducted because of the low water solubility of the substance ( < 5 mg/L).  

Key value for chemical safety assessment

Additional information

In accordance with column 2 of REACH Annex VIII, section 9.2.2.1, the study does not need to be conducted because of the low water solubility of the substance ( < 5 mg/L). In accordance with Annex XI the study does not need to be conducted if it is not scientifically possible to perform the test due to the properties of the test substance or because of analytical limitations of test methods. The 31P-NMR method, typically applied to direct analysis of zinc dialkyldithiophosphates, permits analysis of the substance through quantitation of the dithiophosphate functional group and identification of hydrolysis products based on shifts of this group in the NMR spectrum. OECD 111 guidelines for hydrolysis testing require use of the substance at a concentration of 0.01M or half the saturation concentration and sensitivity to detect a ≤ 10% change in the initial concentration of the substance . Because of the low water solubility of the substance, detection and quantitation of changes in concentration at the levels required by the OECD 111 guideline is beyond the sensitivity of the analytical method.