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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Readily biodegradable.

Key value for chemical safety assessment

Additional information

(2-hydroxyethyl)ammonium nitrate is soluble in water and dissociates to (2- hydroxyethyl)ammonium and nitrate ions. Since no studies on the ready biodegradability of the test substance are available, the biodegradability assessment has been performed with the substance’s two dissociation products. For this purpose, 2-aminoethanol and sodium nitrate have been consulted for the evaluation in a read-across approach.

According to the key-study conducted by BASF AG (1988) following OECD guideline 301A and several supporting guideline studies, 2-aminoethanol was found to be readily biodegradable.

A ready biodegradation study does not need to be conducted for sodium nitrate since the substance is inorganic (Annex VII, REACH). In addition, biodegradation of nitrate can occur under anaerobic conditions, both under natural conditions and as a controlled process in many wastewater treatment plants, resulting in degradation products like nitrite, oxide of nitrogen, nitrogen or ammonia. Nitrate degradation is fastest in anaerobic conditions. In the anaerobic transformation of nitrate into N2, N2O and NH3, the biodegradation rate in wastewater plants at 20 °C is 70 g N/kg dissolved solid/day.

Therefore, it can be concluded that the test substance is expected to be readily biodegradable.