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Environmental fate & pathways

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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 and inherent biodegradability. Based on the results of the tests performed, the substance can neither be considered as readily biodegradable nor inherently biodegradable fulfilling specific criteria. However, in the key studies for ready and inherent biodegradability, the substance exhibited a significant amount of mineralization within 28 days, i.e., average 45% (OECD 301 B) and 58% (OECD 302 B), respectively. Besides, at the end of the incubation periods, the plateau phases were not reached. Hence, although the substance cannot be regarded as rapidly degradable in the environment, it shows a significant potential for biodegradation and is not expected to be persistent.

The substance is eliminated from waste water during waste water treatment to an extent of up to 91% by adsorption to sludge, based on QSAR. Significant sorption to sludge was found in study OECD 302 B, where 54% of the substance was adsorbed to sludge after addition of the substance to the inoculum. In conclusion, elimination from waste water is by either significant adsorption to sludges or by significant mineralization as described above so that presumably quantities of less than 10% will enter surface waters.

The log Koc value (3.844) of the substance indicates that the substance is slightly mobile according to FAO mobility classification, i.e. that it does adsorb rather strongly to soil or sediment.

Furthermore 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.