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Environmental fate & pathways

Adsorption / desorption

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Calcium lactate fully dissociates into Ca2+ ions and lactate in aqueous environments. The adsorption/desorption behaviour of calcium lactate in the environment can be understood in terms of the adsorption/desorption behaviour of calcium ions and lactic acid. The calcium ion may bind to soil particulate or may form stable inorganic salts with sulphate and carbonate ions, but calcium is naturally present in soil. With an octanol-water partition coefficient (log Kow) of -0.72 no significant adsorption of lactic acid to organic matter is expected. Furthermore, lactic acid is readily biodegradable.

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Additional information

According to Annexes VIII and IX, column 2, points 9.3.1 and 9.3.3 of the REACH Regulation, the adsorption coefficient (Koc) does not need to be experimentally determined if, based on the physicochemical properties, the substance can be expected to have a low potential for adsorption (e.g. the substance has a low octanol water partition coefficient), or the substance and its relevant degradation products decompose rapidly.

Calcium lactate fully dissociates into Ca2+ ions and lactate in aqueous environments. The adsorption/desorption behaviour of calcium lactate in the environment can be understood in terms of the adsorption/desorption behaviour of calcium ions and lactic acid. The calcium ion may bind to soil particulate or may form stable inorganic salts with sulphate and carbonate ions, but calcium is naturally present in soil. With an octanol-water partition coefficient (log Kow) of -0.72 no significant adsorption of lactic acid to organic matter is expected. Furthermore, lactic acid is readily biodegradable.

Hence both criteria for adaptation of information requirements are fulfilled. The conduct of an adsorption/desorption study is not considered to be required.