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Environmental fate & pathways

Endpoint summary

Administrative data

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Additional information

The test substance is a solid with very low vapour pressure, very high solubility and low Kow. Leucophor 1111X does not present hydrolysable groups in any of the constituents or by-products and impurities. Based on the comparison with the structural analogous 01, it has been estimated as hydrolytically stable at 7 and 9 at 50 °C. The substance has not hydrolysable chemical groups in the chemical structure.

Based on calculations according to AOPWIN v1.92, the substance is indirectly photodegraded by reaction with hydroxyl radicals in the atmosphere with half-lives of about 20-26 minutes taking into account a 12 -h day and a mean OH radical concentration of 1.5E06 radicals per cm³. Nevertheless, air compartment can be considered as non relevant for the substance under investigation.

Leucophor 1111X is a Stilbene Fluorescent Whitening Agents and, based on the data on analogous substances 03 and 04, it is estimated to undergo direct photodegradation in surface waters, with half-lives ranging from about to 4 to 5 hours in the photic zone of lakes and rivers. Field measurements combined with mathematical modelling of sedimentation and photolysis show that direct photolysis is the only pathway of degradation and effective throughout the aquatic zone due to the dynamics of rivers and layers in lakes. There is no indication of biodegradability.

Based on the physicochemical properties the substance is expected to have a low potential for adsorption; it is characterized by a negative octanol water partition coefficient, due to the high capability to dissolve in water phase. Despite a partial binding onto the surface of suspended particles and onto sediments cannot be completely excluded, this is unlikely to occur in the usual conditions of use, where the substance is adsorbed to the sludge in the STP. Due to the current use of the substance in indrustrial frameworks where waste water treatments are applied, significant release into surface waters is not expected and exposure of sediment is thereby unlikely.

The substance has been estimated as not bioaccumulative based on the log Kow.