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Environmental fate & pathways

Hydrolysis

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Description of key information

Hydrolysis: Half life - 
at ph 4: 1.43 minutes at 20 deg C; 2.04 minutes at 30 deg C and 0.692 minutes at 50 deg C.
at ph 7: 1.90 minutes at 20 deg C; 1.26 minutes at 30 deg C and 0.327 minutes at 50 deg C.
at ph 9: 1.27 minutes at 20 deg C; 1.18 minutes at 30 deg C and 0.233 minutes at 50 deg C.

Key value for chemical safety assessment

Half-life for hydrolysis:
1.9 min
at the temperature of:
20 °C

Additional information

Hydrolysis as a function of pH has been investigated in accordance with OECD/EU test methods. 4-MHHPA was found to be highly unstable in aqueous media at pH 4, 7 and 9 and temperatures of 20, 30 and 50 °C.