Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

ENVIRONMENTAL FATE PROPERTIES

Summary of degradation

Mn3O4 is inorganic and hence the ready biodegradation and hydrolysis tests are not relevant. This is because there is no carbon to be evolved and no chemical bonds to be broken, respectively. The water solubility of Mn3O4 is 0.79 mg/L at 20°C and a transformation dissolution study has shown that the concentration of manganese dissolved and/or transformed is 1221 µg/l after 7 days from 100 mg/L loading (i.e. around 1.5 times the water solubility). Not surprisingly these limit values are rather higher than the background concentration of manganese in European environments (15.9 µg Mn/L in surface water, 452 mg/kg in sediment, 428.6 mg/kg in soil; “Probabilistic Distribution of Manganese in European Surface Water, Sediment and Soil and Derivation of Predicted Environmental Concentrations (PEC)”, Parametrix, 2009 and supported by GEMAS data).

Volatilisation

Data on volatilisation are not available for the substance. Mn3O4 is a solid and hence not volatile.

Distribution modelling

No distribution modelling data exist.

Summary of environmental distribution

An adsorption / desorption screening study test is technically not possible due to the physical nature of the substance (an inorganic solid).

 

Summary and discussion of bioaccumulation

The data are not required as the hazard assessment performed during the chemical safety assessment concludes that the substance is not classified and is of no immediate concern to the environment. Furthermore, manganese is an essential trace nutrient in animals and is required for the photosynthetic process in plants. Hence unacceptable bioaccumulation is highly unlikely to occur in any organism due to their ability to regulate intake and loss from natural sources.

Secondary poisoning

Bioaccumulation ofMn3O4is not expected to occur. Hence no secondary poisoning risk exists.

Assessment of PBT/vPvB Properties

According to the Guidance on information requirements and chemical safety assessment, Chapter R.11: PBT assessment, “the PBT and vPvB criteria of Annex XIII to the regulation do not apply to inorganic substances”. Therefore Mn3O4is not considered to require any further assessment of PBT properties.