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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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