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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The adsorption/desorption study was not conducted as the calcium salts of monocarboxylic acids C14-C22 decompose rapidly to carbon dioxide, water and calcium. Calcium ions in the aqueous environment are expected to remain in solution. Calcium is a naturally occurring element and the adsorption/desorption is not expected to be scientifically relevant.

Key value for chemical safety assessment

Additional information

In accordance with column 2 of REACH Annex VIII, the adsorption/desorption study does not need to be conducted as the substances in the calcium salts of monocarboxylic acids C14-C22 category and their relevant degradation products decompose rapidly. The dissociation and biodegradation in the environment of the substances would result in carbon dioxide, water and calcium. Stable degradation products are not formed in the environment.

No data are required for the partition coefficient of calcium as, in accordance with column 2 of REACH Annex VII, the partition coefficient study does not need to be conducted as it is inorganic. Calcium ions in the aqueous environment are expected to remain in solution. Calcium is a naturally occurring element, found abundantly in the Earth’s crust. Although generally only found in compounds with other elements, the adsorption/desorption of calcium to sediments and soils in the environment is not expected to be scientifically relevant.

In most cases the reactions to form the grease thickener occur in-situ during the grease manufacturing process and consequently these grease thickeners normally only exist in the base oil matrix. In realistic use scenarios, the thickeners will be contained in base oil, with the formulated greases specifically designed to minimise the leaching of the thickener. As such, and given the very low solubility of the substances in water, the concentrations of the substances which would be available for adsorption to soil or sediment are limited.

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