Registration Dossier
Registration Dossier
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EC number: 234-409-2 | CAS number: 12001-85-3
Endpoint summary
Administrative data
Description of key information
Additional information
Zinc naphthenate consists of zinc salts of naphthenic acids and in the aquatic environment is expected to dissociate into zinc cations and naphthenic acid components. As an inorganic metal, the zinc ion will not undergo biodegradation, however, the acid component may be biodegraded. Therefore, only data on the organic (naphthenic acid) component are presented.
Clemente et al (2004) and Herman et al (1993 and 1994) show that naphthenic acids can be degraded by adapted microorganisms and they are at least inherently biodegradable, with certain naphthenic acids and naphthenic acids model compounds being readily biodegradable.
Zinc naphthenate is a mixture of many different constituents and the rate of biodegradation can vary between the compounds present in the UVCB. QSAR predictions are provided for representative structures which bracket the range of potential constituents for the organic component of zinc naphthenate salts. Most representative structures are readily biodegradable, though the structures with three rings (C15, 3 rings; C20, 3 rings) are predicted to be not readily biodegradable. None of the compounds meet the screening criteria for P in the PBT assessment.
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