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EC number: 246-644-8 | CAS number: 25134-21-8
- Life Cycle description
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- Appearance / physical state / colour
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- Density
- Particle size distribution (Granulometry)
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- Additional toxicological data
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
Partition coefficient (LogPow): 1.70 as 1,2,3,6-tetrahydromethyl-3,6-methanophthalic anhydride (METH)
Partition coefficient (LogPow): -4.01 as methylbicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid (METHAc ionized form, environmental conditions)
Key value for chemical safety assessment
- Log Kow (Log Pow):
- -4.01
- at the temperature of:
- 20 °C
Additional information
Partition coefficients have been investigated using methods in accordance with OECD/EU test methods.
A LogPow of 1.70 was determined for 1,2,3,6-tetrahydromethyl-3,6-methanophthalic anhydride (METH).
METH rapidly hydrolyses to methylbicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid (METHAc) in aqueous media.
LogD (distribution coefficients) of the identified isomers (5 -METHAc, 4-METHAc) were estimated taking account for the pH dependence of the substances in aqueous solution.
For the environmental and PBT assessments, the acid forms were considered more significant, with a summary logD= -4.01
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