Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Summary of degradation

MnSO4 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 MnSO4 is 450 g/L at 20°C. Not surprisingly this limit value is considerably 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. MnSO4 is a solid and hence not volatile.

Distribution modelling

No distribution modelling data exist.

Summary of environmental distribution

An adsorption / desorption study on Manganese (2+) has been conducted in 35 soils following the OECD adsorption/ desorption guideline. Data for 100 day incubations show that, as expected, the sorption is pH sensitive. A median Kd value of 1355 mL/g has been determined for all soils (pH range 3.0-8.5).

 

Summary and discussion of bioaccumulation

A study by Szefer, P. and Falandysz, J. (1987) on trace metals in the soft tissues of scaup ducks provides evidence of no bioaccumulation. Furthermore,the risk assessment performed during the chemical safety assessment concludes that the substance is of no immediate concern to the environment. Manganese is also 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 of MnSO4 is not expected to occur. Hence no secondary poisoning risk exists.

Assessment of PBT/vPvB Properties - Comparison with the Criteria of Annex XIII

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 Mn2+ is not considered to require any further assessment of PBT properties.