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Environmental fate & pathways

Adsorption / desorption

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Description of key information

In accordance with Column 2 adaptation statement of REACH Annex VIII and IX, adsorption/desorption screening and further studies on adsorption/desorption, information requirements 9.3.1 and 9.3.3, may be omitted since the log Kow value for the substance is <3.0 and has low potential for adsorption (CSR section 1.3).  (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. 

Key value for chemical safety assessment

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.