Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

EDTA is resistant to hydrolysis.

Photolytic degradation is practically only relevant for the Fe(III)EDTA complex and has been shown in surface waters. It is depending on pH and irradiation; in summer photodegradation rates will be higher and mainly when pH is <= 7.

Further abiotic degradation processes as reaction with OH-radicals or single oxygen have (compared to the direct photolysis) very low reaction constants and are of no environmental significance.

EDTA-CaNa2 is inherently biodegradable in water.

Biodegradation is enhanced at higher pH (>8) in water.

Biodegradation rates in soil are variable, depending on complexation, soil type and pH.

More recent studies indicate an increased degradation compared to older studies.

Based on the estimated logKow (<3) and available BCF study in fish with radiolabelled EDTA (BCF range 1.1-1.8) it can be concluded there is low potential for bioaccumulation for EDTA-CaNa2.

The estimated log Koc value for EDTA-CaNa2 is 1 (worst case). This is less than the threshold value of 3 indicating no adsorbing potential for this compound.

Due to high water solubility and low adsorption, EDTA will eventually leach to ground- and surface waters and not accumulate in soil. Due to pH fluctuations in surface water, moderate substitution rates and the combined photodegradation and biodegradation, all EDTA salts will eventually disappear from surface water.