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Environmental fate & pathways

Hydrolysis

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Description of key information

Two studies (one key and one supporting) confirm hydrolytic stability of TBHP.  Using methods equivalent to OECD guideline 111 the key study demonstrated hydrolytic half-lives >1 year  at pH 4, 7 and 9 and 50C.

Key value for chemical safety assessment

Additional information

The key study reveals an environmental half-life >1 year (no significant degradation seen over 5 days at 50 C and pH values of 4, 7 and 9: environmental half-life >1 year therefore predicted, as per OECD guideline 111).

The supporting study concludes that TBHP is highly stable in water but the addition of Fe3+ appeared to cause limited degradation of TBHP in water. A DT50 of 168 days was calculated for the abiotic degradation of TBHP in the presence of 12 mg/L Fe2+. Addition of the Fe2+ salt also resulted in the formation of higher amounts of an unidentified degradation product (unknown 1). It is assumed that TBHP oxidizes Fe2 +.