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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

Three reliable simulation studies of EDTMP-H in water and sediment systems are available. Low but recordable levels of removal are seen in such systems, particularly in the presence of natural or simulated light.

Key value for chemical safety assessment

Additional information

A degradation rate in river and lake waters of ca. 2 - 7% after 60 days was determined in a reliable study conducted according to generally accepted scientific principles. In the presence of natural light, 11 - 20% degradation was observed over the same time period (Saeger, 1978).

A degradation rate in a water-sediment microcosm of 10.4-25.2% after 38 days was determined in a reliable study conducted according to generally accepted scientific principles (Saeger, 1979).

A reliable test demonstrates that biodegradation subsequent to abiotic degradation (UV exposure, 5 h) results in significantly higher removals of EDTMP (based on TOC) than biodegradation alone, over 20-day duration period. A longer-duration bioreactor test showed significant removals based on TOC (Brandenburg Uni. Tech., 2010).