Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

The substance is abiotically stable under environmentally relevant conditions: At pH 7 its DT-50 is > 1 year.

The substance was tested for ready biodegradability using activated sludge and sewage under OECD 301 B testing conditions. Both studies show that the substance is not readily biodegradable. Only maxmium 13% were mineralized during the tests. However the mineralization plateau was not reached yet. Hence, prolongation of the OECD 301 B study with activated sludge shows that 57% of the substance were minalized within 60 days. Based on this finding, the substance is inherently biodegradable.

The substance is eliminated from waste water during waste water treatment to an extent of up to 94% by adsorption to sludge, based on distribution modelling (QSAR STWPWIN of EPISUITE). Since the substance is almost completely eliminated from waste water, quantities which may enter surface waters and soil (via surface water) will be below 10%.

The log Koc value (5.41) of the substance indicates that the substance is immobile according to FAO mobility classification, i.e. that it does adsorb very strongly to soil or sediment.

The substance has a low potential for bioaccumulation, since its log Kow is < 3 (0.4685). Hence, bioaccumulation is of no concern.

The CSA conducted for this substance shows that there is no risk for the environment, since Risk Characterization Ratios for all uses of this CSR are below 1. According to REACH Annexes VIII to X, Column 2, Specific rules for adaptation from Column 1: Further degradation testing shall be considered if the chemical safety assessment […] indicates the need to investigate further the degradation of the substance”. Based on current available data and current assessment, every usage covered by the chemical safety assessment is safe, whatever environmental compartment is considered. As a consequence, further studies to assess the fate of the substance in environmental compartment surface water/sediment, soil and groundwater are not necessary.