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EC number: 243-072-0
CAS number: 19438-60-9
in air (4-MHHPAc): Half-life for reaction with photochemically-produced
hydroxyl radicals estimated to be 30.1 hours.
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.
As a result of this rapid hydrolysis, in the water compartment, the
environmental fate of the acid degradation product (4 -MHHPAc) should be
biodegradability in water: 2% in 28 days
potential for bioaccumulation of 4-MHHPAc (the
hydrolysis produc of 4-MHHPA) is
low, less than 2.4 L/Kg, as expected from low values of log Kow
for both substances.
Henry's Law Constant
The Henry's Law constants of
1,2-Cyclohexanedicarboxylic acid, 4-methyl- (4-MHHPAc), as hydrolysis
product of hexahydro-4-methylphthalic anhydride, was considered for the
environmental assessment. The value of 2.75E-4 Pa m³/mol shows that
4-MHHPAc is essentially non volatile from surface water.
in environmental compartments has been calculated using a Fugacity model
according to Mackay, Level III. Distribution in various environmental
compartments is estimated as:Air=
0.236%; Water= 4.89%; Soil= 94.8% and Sediment= 0.028%.
the substance is known to be unstable, rapidly hydrolysing to the
corresponding di-carboxylic acid in aqueous media and this process is
expected to occur in the environment should release occur. As a result
the calculated distribution may not be a reasonable estimate. Similar
modelling of the degradation product of the substance, 4 -methyl-1,2
-cyclohexanedicarboxylic acid, estimated distribution in the various
environmental compartments as:Air=
0.08%; Water= 20.4%; Soil= 79.4% and Sediment= 0.109%.
of the modelling, undertaken as part of the CSA, and taking account of
the uses of the substance, does not support these estimates.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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