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Environmental fate & pathways

Hydrolysis

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Description of key information

The hydrolysis of Dioctyl phosphonate at room temperature doesn't occur in short time period (3 days) and also at high temperature its hydrolysis is not fast and it is not complete (after 3 days at T=50 °C 92.77 % of starting material Dioctyl phosphonate was found and only 0.77 % of octyl alcohol was present in solution. The remaining portion 6.46 % was probably the monooctyl phosphite).

Key value for chemical safety assessment

Additional information

This study was performed as preliminary test to evaluate the hydrolysis of test item. According to the REACH Regulation (EC n. 1907/2006), Annex VIII, Column 2 the hydrolysis study is not necessary if the substance is readily biodegradable. Dioctyl phosphonate is ready-biodegradable and the hydrolysis study is not required. However this specific experiment was performed to quantify the rate and the percentage of the fully hydrolysis process. The hydrolysis of test item was investigated with two analytical methods because of the different nature of the two complete hydrolysis products: HPLC-IC and GC-FID analysis were performed to quantify respectively free phosphites and octyl alcohol. The hydrolysis of Dioctyl phosphonate at room temperature doesn't occur in short time period (3 days) and also at high temperature its hydrolysis is not fast and it is not complete (after 3 days at T=50 °C 92.77 % of starting material Dioctyl phosphonate was found and only 0.77 % of octyl alcohol was present in solution. The remaining portion 6.46 % was probably the monooctyl phosphite).