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EC number: 243-072-0
CAS number: 19438-60-9
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.
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