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Environmental fate & pathways

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Description of key information

Metal carboxylates are salts consisting of metal cation and carboxylic acid anion. Based on the solubility of calcium dibenzoate in water, a complete dissociation resulting in calcium and benzoate ions may be assumed under environmental conditions. The respective dissociation is in principle reversible and the ratio of the salt /dissociated ions is dependent on the metal-ligand dissociation constant of the salt, the composition of the solution and its pH.

However, under environmental conditions, a reunion of the dissociated ions is highly unlikely and it may reasonable be assumed that the respective behaviour of the dissociated calcium cations and benzoate anions in the environment determine the fate of calcium dibenzoate upon dissolution with regard to (bio)degradation, bioaccumulation, partitioning resulting in a different relative distribution in environmental compartments (water, air, sediment and soil) and subsequently its (eco)toxicological potential.

In the assessment of environmental fate of calcium dibenzoate, read-across to the assessment entities soluble calcium substances and benzoic acid is applied since the ions of calcium dibenzoate determine its environmental fate. Since calcium ions and benzoate ions behave differently in the environment, in respect of stability, degradation, transport and distribution, a separate assessment of the environmental fate of each assessment entity is performed. Please refer to the data as submitted for each individual assessment entity.

Additional information

In order to evaluate environmental fate of the substance calcium dibenzoate, information on the assessment entities calcium cation and benzoate anion is considered. For a documentation and justification of that approach, please refer to the separate document attached to section 13, namely Read Across Assessment Report for calcium dibenzoate.