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Environmental fate & pathways

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Partitioning of substances into the different environmental compartments depends mainly on their physico-chemical properties. Since the water solubility of Tetrasodium ethylenediaminetetraacetate (EDTA-Na4; CAS 64-02-8) is high (~ 500 g/L) and the log Pow value low (< 1), the substance is expected to mainly distribute to the water phase. However, as EDTA-Na4 is inherently biodegradable fulfilling specific conditions (biodegradable under enhanced conditions), the substance will not be persistent in the environment.

EDTA-Na4 is not expected to evaporate into the atmosphere due to its low vapor pressure. If entering the atmosphere, EDTA-Na4 will be rapidly degraded by photochemical processes. Thus, long-range transport through the atmospheric compartment is not expected. Additionally, hydrolysis is not a relevant degradation pathway in the environment, since neither strong acids nor alkalis cause any degradation (according to EU Risk Assessment 2004). At exposures of 0.76 and 0.08 mg/L, 14C-EDTA exhibited extremely low 28d-whole fish bioconcentration factors of 1.1 - 1.8. After transfer to clean water, elimination showed 81% at 0.76 mg/l and 60% at 0.08 mg/L in 14 days. Thus, the test substance does not bioaccumulate in aquatixc organisms.