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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information


Summary of degradation
MnCO3 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. In a water solubility study, conducted according to the standardised guideline OECD 105 (flask method), the water solubility of MnCO3 was found to be 3.63 mg/L at 20°C. In a transformation dissolution study, conducted in accordance with the standardised guideline OECD 29, the concentration of manganese dissolved and/or transformed was 9208.2 µg/L after 7 days from an initial substance loading rate of 100 mg/L (i.e around three 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).

Data on volatilisation are not available for the substance. MnCO3 is a solid and hence not volatile.

The 72 hr adsorption/desorption study (OECD 106) on MnCl2 (a more soluble/ readily available form of manganese (Mn2+)) in 35 different soil types illustrate that adsorption is pH sensitive. A median Kd of 994 mL/g was determined for all soil types used (pH range 3.0-8.5).

Summary and discussion of bioaccumulation
No experimental data on bioaccumulation exist. 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 of MnCO3 is not expected to occur. Hence no secondary poisoning risk exists.

Distribution modelling
No distribution modelling data exist.

Summary of environmental distribution

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 MnCO3 is not considered to require any further assessment of PBT properties.