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Environmental fate & pathways

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The sorption capacity of phthalic acid was performed at three different soils and different pH-values by batch equilibrium studies. The highest Koc of 31 was observed on an acidic forest soil (pH 2.8), and therefore the substance is not even adsorptive concerning the ionised form.

A calculated Henry´s Law Constant of 2.21E-7 Pa m³/mole documented no potential of phthalic acid to leave the aquatic compartment.

The distribution of the hydrolysis product phthalic acid in a "unit world" was calculated according to the Mackay fugacity model level I based on the physico-chemical properties. The main target compartment for phthalic acid is water with 99.91 %, followed by soil and sediment with 0.042 and 0.043%, respectively.