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Environmental fate & pathways

Endpoint summary

Administrative data

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Additional information

The test substance is a solid powder under environmental conditions. Based on the thermal behaviour, the substance melts at ca 160 °C and boils at ca 200 °C; the vapour pressure has been estimated at 38 Pa at 25 °C. The potential evaporation of Fluorescent Brightener 363 can be considered negligible, thus the possibility that the substance could be dispersed in air, the amount and the persistence in this compartment are related to the granulometry, which confirms the non-relevance of this compartment.

Fluorescent Brightener 363 is highly water soluble and, based on the physicochemical characteristics, it is expected to be stable under typical environmental pH conditions.

The primary source of possible substance environmental release is represented by industrial waste waters, thus the fate and pathways of the substance in surface water is of primary concern. The substance did not show any potential of microorganisms impact in the specific test. Thus, it is deemed to not negatively impact the STP systems.

Considering the intended use in aqueous-based treatments, Fluorescent Brightener 363 is not expected to be directly released to air, either soil. As abovementioned, the physicochemical properties of the item confirm that the air compartment can be considered as not relevant and that the soil compartment in expected to be non concerning the substance.

Based on the chemical characteristics, hydrolysis is not expected to be an important degradation/transformation process for Fluorescent Brightener 363.

Although it was not investigated, phototransformation in air/water/soil is not expected to be an important mechanisms for Fluorescent Brightener 363. During none of the experiments performed, no sign, able to raise any suspect, was recorded from this point of view.

Fluorescent Brightener 363 is not readily biodegradable.

The substance is expected to possess a low affinity for soil / sediment. The binding capacity (or “stickiness”) of the Fluorescent Brightener 363 to solid surfaces is expected to be low, on the basis of the physicochemical properties and the estimated partitioning coefficient value. In addition, during the experiment of biodegradability potential, no adsorption was recorded.

There are no empirical bioaccumulation data available for the substance under investigation, nevertheless on the basis of the negative log Pow it is expected to be characterized by a low potential for bioaccumulation and/or a low potential to cross biological membranes.