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EC number: 204-616-2
CAS number: 123-30-8
is soluble (6500 mg/L) and is inherently biodegradable in water with
pre-adapted sludge. It has a low capacity to volatilise from solution to
the air (Henry's law constant of 8.954E-005 Pa m3/mol-1) and
undergoes rapid phototransformation in the atmosphere (half-life of 1.7
hours in the presence of hydroxyl radicals at1.5X10+6 hydroxyl radicals
per cu assuming 12 hours daylight).
partitioning coefficient (log Kow = -0.09) indicates that 4-aminophenol
does not have a high potential for adsorption to soil or sediment (log
Koc = 0.59). It has a low potential for bioaccumulation in aquatic and
terrestrial habitats (BCF <=0.46 L/kg). Assuming predominate emissions
to the water compartment, Mackay Level III fugacity predictions estimate
1.61%, 98.2%, 0.18% and 3.24e-007 % partitioning in the soil, water,
sediment and air compartments, respectively.
-aminophenol is amphoteric with both amine and hydroxyl functional
groups; pKa values for these groups are 5.48 and 10.46, respectively. At
environmental pH values from 5 to 9, the substance is expected to exist
primarily as the neutral species.
rate constant for the vapor-phase reaction of 4-aminophenol with
photochemically-produced hydroxyl radicals has been estimated as 74.2471
E-12cu cm/molecule-sec at 25 deg C using a structure estimation method
(aopWin v1.92). This corresponds to an atmospheric half-life of about
1.7 hours at an atmospheric concentration of 1.5X10+6 hydroxyl radicals
per cu cm (aopWin v 1.92).4-Aminophenol is expected to undergo fairly
rapid oxidation in the presence of air and may directly photolyze due to
its absorption in the environmental UV spectrum (max= 294 nm). Hence,
the substance is unlikely to persist in air. In
addition, the vapour pressure (0.00053 Pa at 25°C) and the Henry's law
constant (8.954E-005 Pa m3/mol) of the substance indicate that the
substance is not likely to volatilize extensively from surfaces into air
under dry conditions or from water. Therefore,
any concentrations of the substance in air are considered negligible.
is not expected to undergo hydrolysis in the environment due to the lack
of hydrolyzable functional groups. Biodegradation is not expected to be
a primary route of degradation in the environment. The
substance is not readily biodegradable but can be considered inherently
biodegradable with pre-adapted sludge. The substance is degraded at
rates of 92%, 87% and 66% after 22d, 5d and 8d respectively when exposed
to pre-adapted sludge (see section 126.96.36.199.2).This
is an indication that the substance has the potential for degradation
under favorable conditions, such as STP or biological treatment plant.
The substance degrades primarily via abiotic
processes and to a much lesser extent via biotic processes such as
microbial degradation. Abiotic
degradation occurs rapidly when the substance is exposed to light and
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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