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Environmental fate & pathways

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Description of key information

The substance is insoluble and hence, its log Kow is expected << 3. Hence, its log Koc is expected << 3, too. For risk assessment considerations, its Koc is set as 1 L/kg (log Koc=0), which classifies the substance as mobile according to FAO classification. The substance is used as fine texture powder:. Hence any particulate material which may enter STPs will be retained by sedimentation and/or flocculation. The particulate matter of the substance in aqueous solutions was confirmed by an experimental study (following OECD 106, non-GLP), which showed that the test material was removed by 0.22 µm fibrous membranes. Substance particles will hence not be part of effluents. Groundwater contamination is excluded since particles will be filtered during passage through sediment and/or soil layers. Furthermore the substance occurs as natural mineral in the environment (Herzenbergit) which makes it impossible to distinguish between artificial and natural substance. Hence, the issue of transport and distribution in environmental compartments surface water, groundwater, soil and sediment is of no concern.

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