Hexasodium 2,2'-[vinylenebis[(3-sulphonato-4,1-phenylene)imino[6-[(2-cyanoethyl)[2-(2-hydroxyethoxy)ethyl]amino]-1,3,5-triazine-4,2-diyl]imino]]bis[benzene-1,4-disulphonate]

Endpoint summary

Description of key information

Optical Brightener 380 is highly water soluble and it is expected to be stable under typical environmental pH conditions. The primary source of the possible substance environmental release is represented by industrial waste waters; sediment, soil and air compartments are considered to be negligible.

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

Optical Brightener 380 is neither readily nor inherently biodegradable.

Additional information

The test substance is a solid powder under environmental conditions. Based on the thermal behaviour, the substance does not melt, either boil up to high temperature. Evaporation is not a relevant pathway for Optical Brightener 380, thus the possibility to be dispersed in air, the amount and the persistence in this compartment are related to the actual used form, which confirm the non-relevance of this compartment.

Optical Brightener 380 is highly water soluble and, based on the chemical characteristics, it is expected to be stable under typical environmental pH conditions. The primary source of the possible substance environmental release is represented by industrial waste waters, thus the fate and pathways of the substance in surface water can be considered of primary concern. The substance did not show any potential of microorganisms impact neither in the specific test (see IUCLID section 6), or in the biodegradation experiments. Thus, it is deemed to not negatively impact the STP systems.

Considering the intended use in aqueous-based treatments, Optical Brightener 380 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 Optical Brightener 380, too.

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

Although it was not investigated, phototransformation in air/water/soil is not expected to be an important mechanisms for Optical Brightener 380. During none of the experiments performed, sign, able to raise any suspect, was recorded, from this point of view.

Optical Brightener 380 is neither readily nor inherently biodegradable.

The substance is expected to possess a low affinity for soil / sediment. The binding capacity (or “stickiness”) of the Optical Brightener 380 to solid surfaces is expected to be low, on the basis of the physicochemical properties and the estimated partitioning coefficient values. In addition, during the experiment of biodegradability potential, no significant adsorption was observed.

The substance is expected to possess a low potential for bioaccumulation, based on the screening evaluation taken into account the experimental log Pow. Due to the molecular mass greater than 700 and due to the steric hindrance, the possible passage of gill membranes or cell membranes of respiratory organs is expected to be negligible. In addition, the bioaccumulative potential of test item was assessed in Japanese Killifish; the accumulation rate resulted to be lower than ca 0.14 at the concentration level of 2 ppm (corresponding to the actual conc. of 1.7 ppm) and lower than 1.3 at the concentration level of 0.2 ppm.