Manganese di(acetate)

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.035 mg/L

Assessment factor:

1 000

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

0.345 mg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0.004 mg/L

Assessment factor:

10 000

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

6.5 mg/L

Assessment factor:

100

Extrapolation method:

assessment factor

Sediment (freshwater)

Hazard assessment conclusion:

no hazard identified

Sediment (marine water)

Hazard assessment conclusion:

no hazard identified

Hazard for air

Air

Hazard assessment conclusion:

no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:

no exposure of soil expected

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

no potential for bioaccumulation

Additional information

In general, Manganese (II) acetate is not released into the environment due to the strictly controlled conditions during manufacture, transportation and use. Consequently, not hazard for aquatic and sediment organisms, microorganisms, avian and terrestrial organisms is expected.

Regarding the hazard for air, the low vapour pressure, high decomposition temperature, high particle size and the fact that Manganese (II) acetate does not belong to neither ozone-depleting substances nor green house gases, Mn(acO)2 would also pose not harm in case of accidental release.

Since the Koc did not need to be determined due to exposure considerations, the PNEC sediment cannot be calculated according to ECHAs “Guidance on information requirements and chemical safety assessment, Chapter R.10: Characterisation of dose [concentration]-response for environment”, chapter 10.5.2, equation R.10-2 (2008). However, since this formula only considers uptake via the water phase, the equation is based on the assumption that sediment-dwelling organisms and water column organisms are equally sensitive to the chemical, and Manganese (II) acetate as an inorganic salt has a very low LogPow and high water solubility, the PNECs sediment can assumed to be equal to the PNECs water. Since Plectonema boryanum is the most sensitive aquatic species, the PNECs water are therefore calculated from these results, and the sensitivity of all other species is up to three magnitudes lower, it can be assumed that the actual risk would be overestimated.

Although no release of the compound is expected, the PNECs water are extrapolated out of completeness reasons applying the standard assessment factors as described in ECHAs Guidance R.10, based on the results of the most sensitive species, Plectonema boryanum, to 0.0345 mg/L, 0.00345 mg/L and 0.345 mg/L (PNEC aqua freshwater, marine water and intermittent releases).

Also, the PNEC STP was calculated out of completeness reasons. Since the testing for toxicity to microorganisms could be waived due to exposure considerations, the PNEC could not be extrapolated from standard endpoints. However, data on the ciliate Tetrahymena pyriformis is available, and so the PNEC STP could be calculated according ECHAs Guidance R.10 to 6.5 mg/L by applying assessment factors.

In summary, all the given results from testing Manganese (II) acetate and read-across substances on aquatic organisms, the calculated PNECs and the strictly controlled conditions indicate that no or a negligible risk arises from Manganese (II) acetate. Also, Manganese (II) acetate does not need to be classified, neither according to Directive 67/548/EC (DSD) nor Regulation 1272/2008/EC (CLP).

Conclusion on classification

Based on aquatic toxicity test results obtained, Manganese (II) acetate is not classified and labelled according to Directive 67/548/EC (DSD) and Regulation 1272/2008/EC (CLP).