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
The hydrolysis endpoint has been waived as zinc naphthenate is highly insoluble in water. In the water solubility study, all test solutions showed undissolved material after the stirring period so the water solubility of zinc naphthenate was concluded to be <10 mg/L, and is likely to be <1 mg/L. The adsorption coefficients of the representative structures of zinc naphthenate were estimated using a QSAR model (KOCWIN v2.00 in EPISuite v4.11, US EPA 2010). The adsorption coefficients of the representative constituents of zinc naphthenate are estimated by QSAR to be in the range of 55.11 to 4.75 E+09 (log Koc 1.74 to 9.68).
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. Furthermore, as zinc is an essential element which is actively regulated by organisms, bioconcentration/bioaccumulation is not considered relevant. The ranges of BCF values are the result of active regulation mechanisms that keep the internal zinc concentration of the organisms within an optimal range.
QSAR predictions estimate the BCF values for the organic (naphthenic acid) components of the zinc naphthenate salt to be in the range of 3.162 to 207.7 L/kg ww and therefore the substances would not meet the B criteria in the PBT assessment. The organic (naphthenic acid) components of the zinc naphthenate salt are at least inherently biodegradable, with certain naphthenic acids and naphthenic acids model compounds being readily biodegradable. Clemente et al (2004) and Herman et al (1993 and 1994) show that naphthenic acids can be degraded by adapted microorganisms and QSAR predictions for representative structures show most compounds are readily biodegradable, though the structures with three rings are predicted to be not readily biodegradable, and none of the compounds meet the screening criteria for P in the PBT assessment.
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