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Environmental fate & pathways

Hydrolysis

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Description of key information

abiotic degradation hydrolysis is lower than 10% after 5 days at 50°C for the pH 4.0 and pH 7.0, but is significant at pH 9 ( > 10% in 5 days at 50°C in the preliminary test).

Key value for chemical safety assessment

Additional information

One key (Klimisch score=1) hydrolysis study (according to EU method C.7, OECD 111, Annex to Commission Directive 92/69/EEC to fulfil requirements of ltalian Legislative Decree No. 52 dated February 3, 1997 implementing Council Directive 92/32/EEC ) was identified for FEXO-07.

Results:

pH= 9

T=50°C

hydrolysis rate constant=0.0049 h-1

half-life= 142 h

type: (pseudo-)first order (= DT50)

pH= 9

T=40°C

hydrolysis rate constant= 0.0006 h-1

half-life=1075 h

type: (pseudo-)first order (= DT50)

pH=9

T=25°C

hydrolysis rate constant= 0.0000242 h-1

half-life=28633 h

type: (pseudo-)first order (= DT50) calculation with Arrhenius equation