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Diss Factsheets

Ecotoxicological information

Sediment toxicity

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Description of key information

No sediment toxicity studies were available for DTPA acid.  However, based on a log Kow <3 and low predicted adsorption and binding of DTPA, sediment testing is not necessary.

Key value for chemical safety assessment

Additional information

In a laboratory test, solutions of H4EDTA and ZnEDTA were eluted through various surface soils and were found to move quite readily through the soils and be only very slightly adsorbed (Cheng et al., 1972). A model calculation of the distribution of EDTA metal complexes between water and suspended solids resulted in a finding that <1% of the total EDTA is adsorbed, and according to the fugacity model Mackay level I, the preferred environmental component for EDTA is the hydrosphere (99.999%) (EU, 2004). Thus, based on a read across approach from EDTA, low adsorption is predicted for DTPA, and sediment testing is therefore not necessary for DTPA.

Cheng SM, Thomas RL, Elrick DE. 1972. Reactions and movements of EDTA and ZNEDTA in soils. Can. J. Soil. Sci. 52:337 -341.

European Union (EU). 2004. European Union Risk Assessment Report: edetic acid (EDTA)