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EC number: 202-180-8
CAS number: 92-70-6
The environmental distribution of the substance cannot be estimated with
a fugacity model as the available physico-chemical properties were
determined for the undissociated acid and not for the dissociated form
that is present under environmental relevant pH conditions. However, as
both volatilisation and adsorption are not expected for the dissociated
substance, it can be assumed that the hydrosphere is the main target
compartment for 3-hydroxy-2-naphthoic acid. 3-Hydroxy-2-naphthoic acid
is not readily biodegradable as was shown in a test according to OECD
301 C (1.3 % after 14 days). In a Zahn-Wellens test (OECD 302 B) with
adapted inoculum the chemical was inherently biodegradable (85 % after
21 days). In a 42d bioaccumulation study with Cyprinus carpio BCF values
of With an assessment factor of 50 a PNECaqua of 136 μg/l was derived
from the lowest available NOEC of 6.8 mg/l found for green algae.
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