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Environmental fate & pathways

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Due to the ionic structure under environmentally relevant pH conditions, no adsorption onto the organic fraction of soil or sediments of EDTA, a structural analogue of the substance, is expected (EU Risk Assessment, 2004). HEDTA is expected to behave in a similar manner to EDTA given their similar ionisation and binding potentials. As such it is likely that HEDTA will remain in salt form in typical environmental conditions (e.g. neutral to mild acidic/alkaline conditions). Based on QSAR modelling (KOCWIN) the Koc is likely to be in the order of 2.138E-07 L/kg in salt form. In highly alkaline conditions the Koc is estimated to be in the order of 10 L/kg for the ionised compound.