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EC number: 243-072-0
CAS number: 19438-60-9
Phototransformation in air
Half-life for reaction with
photochemically-produced hydroxyl radicals: 30.1 hours.
Overall degradation rate constant with OH
radicals= 1.10E-6 cm3/(molecule-day)
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.
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.
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