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Environmental fate & pathways

Adsorption / desorption

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Metal carboxylates such as zinc dipropionate are substances consisting of a metal cation and a carboxylic acid anion. Based on the solubility of zinc dipropionate in water (40.5 g/L at 30 °C), a complete dissociation of zinc dipropionate resulting in zinc ions and propionate ions may be assumed under environmental conditions. Since zinc ions and propionate ions behave differently in respect of adsorption / desorption, 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. In brief, based upon a calculated log Koc for propionic acid, adsorption to solid soil phase is not expected. For metals, adsorption/desorption translates in the distribution of the metals between the different fractions of the environmental compartment, e.g. the water (dissolved fraction, fraction bound to suspended matter), soil (fraction bound or complexed to the soil particles, fraction in the soil pore water,...). This distribution between the different compartments is translated in the partition coefficients between these different fractions:

Kp for solid particulate matter and water (Kpsusp): 110000 l/kg (log value: 5.04) (ECB 2008)

Kp for water and sediment (Kpsed); 73000l/kg ( log value:4.86) (ECB 2008)

Kd for marine waters is 6010 l/kg (log value: 3.78)

Kd for solids-water in soil is 158.5 l/kg (log value: 2.2)

Key value for chemical safety assessment

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