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Environmental fate & pathways

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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 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. In brief, based upon a calculated log Koc for propionic acid, adsorption to solid soil phase is not expected. From the water surface propionic acid will not evaporate into the atmosphere. According to the results of the Mackay LEVEL 1 calculation, over time propionate will preferentially distribute into water.

For metals, the transport and distribution over the different environmental compartments 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,...) is described and quantified by the metal partition coefficients between these different fractions. Information on these partition coefficients is given under 5.6.

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