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Environmental fate & pathways

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Additional information

(Q)SAR-modelled Koc values for dimethyl terephthalate (obtained with the KOCWIN v2.00 model of the US EPA) range from 30.96 to 109.3 L/kg. Based on these values, dimethyl terephthalate is classed as moderately mobile to mobile and is expected to have a low tendency to adsorb to soils and sediments.

The low Koc values modelled for dimethyl terephthalate also imply a low tendency to associate with sludge solids during the primary settlement and secondary biological stages of waste water treatment. The majority of the DMT load contained in a treatment plant influent load may therefore be expected partition to the aqueous phase and to be routed toward aerobic biological treatment.

Henry's Law constant was calculated using experimental values for vapour pressure and water solubility. The value determined is 0.870696 Pa m3/mole at 20°C (equivalent to Log H value of -0.06013).

The resulting value indicates that dimethyl terephthalate is unlikely to partition from aqueous systems to the atmosphere.