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Environmental fate & pathways

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Biodegradation is not applicable to metals/inorganic substances. Tests are not to be conducted if the substance is inorganic (Column 2 of Annex VII of REACH regulation)

Zinc:

For water, information is available on the removal of metals from the water column (given under 5.6.). The removal from the water column was modeled referring to the EUSES model parameters and different conditions of pH.Zinc is removed by > 70% under the reference conditions for the EU regional waters (EUSES) (see section 5.6.: "removal from the water column").

Ammomium:

In addition, in the anearobic transformation of ammonium, one group of bacteria oxidizes ammonium to nitrite while another group oxidizes nitrite into nitrate. The average biodegradation rate in wastewater plant at 20 degrees Celsius is 52 g N/kg dissolved solid/day. Nitrate degradation is fastest in anaerobic conditions. In the anaerobic transformation of nitrate into N2, N2O and NH3, the biodegradation rate in wastewater plant at 20 degrees Celsius is 70 g N/kg dissolved solid/day.