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Environmental fate & pathways

Adsorption / desorption

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FATTY ACIDS, C8-10, ZINC SALTS:

Fatty acids, C8-10, zinc salts is readily biodegradable and fatty acids degrade by the β-oxidation pathway. The environmental fate and distribution of the dissociation products of this substance in water are better assessed according to the dissociation products in water as follows:

(i) the mechanisms for partitioning of Zn2+ in environmental media, including the adsorption and/or absorption by organic matter and living cells, are understood to be different from those traditionally attributed to carbon-based substances. For the transport and distribution of zinc over the different environmental compartments, please see the hazard assessment of "Zinc" within the framework of Regulation (EC) No 1907/2006 as described in the respective assessment entity for "Zinc".

(ii) QSAR estimates indicate an affinity of fatty acids to solid surfaces. Koc values of 69.63 L/kg for octanoic acid and 261.8 L/kg for decanoic acid were estimated based on QSAR using EPISuite (V.4.00 - 4 .11) from a logKow of 3.05 and 4.09, respectively. However, fatty acids are readily biodegradable by sludge microorganisms and also by soil/sediment microorganisms and thus expected to get readily biodegraded while adsorped and not to accumulate.

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