Registration Dossier
Registration Dossier
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EC number: 242-599-3 | CAS number: 18820-29-6
Endpoint summary
Administrative data
Description of key information
Additional information
ENVIRONMENTAL FATE PROPERTIES
Summary of degradation
MnS 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 MnS is 6.16 mg/l at 20°C and a transformation dissolution study has shown that the concentration of manganese dissolved and/or transformed is 18181.8 µg/l after 7 days from 100mg/L loading (i.e. around 3 times higher than the water solubility). Not surprisingly these values are in excess of 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. MnS 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 sorption guideline. Data for 100 day incubations show that, as expected, the sorption is pH sensitive. A median Kd value of 650 ml/g has been determined for all soils (pH range 3.0-8.5).
Summary and discussion of bioaccumulation
The bioaccumulation study on MnS is waived on the basis that considerable existing data is already available which establishes the following points:
1) Manganese is an essential element and nutrient for animals and as such is regulated by organisms depending on their biological burden and requirement.
2) Bioaccumulation testing is poorly applicable to essential metals because of the homeostatic regulation of essential metals.
3) Existing data demonstrates that whilst manganese can bioaccumulate, at lower trophic levels biomagnification up the food chain is weak or does not occur.
4) Whilst there is a significant volume of published literature on the bioaccumulation of manganese that may be used to determine the bioconcentration and bioaccumulation factors these data are largely based on soluble manganese salts, as opposed to the registered substance. MnS has relatively low water solubility and bioavailability, as shown in the transformation dissolution data included in this dataset. Data on the more soluble salts commonly referenced in existing literature are likely to over-estimate the bioaccumulation potential of MnS.
Additional supporting data is included as robust study summaries; namely papers by Prabhu (2019, Simonetti (2018), Ikemoto (2008a) and Campbell (2005).
Secondary poisoning
Bioaccumulation of MnS is not expected to occur. Hence no secondary poisoning risk exists.
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