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EC number: 432-690-8
CAS number: -
Under environmental conditions the substance dissociates
completely in water. Distribution modelling (Mackay) yields 100% of the
substance in the aqueous phase and not exposed to sediment. Bivalent
metal cations like Ca2+ are present in the aqueous environment in high
concentrations compared to the substance and form clusters with the
anionic substance. These clusters exhibit different partitioning
behaviour. Specific interactions and ion-exchange interactions between
the substance and suspended solids may contribute strongly to the
observed partitioning (Poiger 1994). Precipitation as the calcium or
magnesium salts is a pathway that can be significant (Baughman 1994).
There is sufficient weight of evidence leading to the assumption that
the substance itself is not exposed and is not harmful to sediment
It can be shown by exposure estimation with the EUSES Modelling
program version 2.1 that under the use conditions of the test item the
sediment concentrations are low. As measured sorption/desorption data
are available from an OECD 106 study (see IUCLID Section 5.4.1) it is
justified to apply the Equilibrium partitioning method to derive a
reasonably PNEC sediment (PNEC sediment (freshwater): 251 µg/L sediment
dw). Based on the estimated PEC local sediment and the PNEC sediment it
can be demonstrated that sediment toxicity testing is not warranted. The
statement given above fulfills the requirement for waiving as given in
1907/2006/EC Annex X, Column 2, 9.5.1.
Poiger, T., Behavior and Fate of Detergent-derived Fluorescent
Whitening Agents in Sewage Treatment, Dissertation ETH Zürich No. 10832,
EWAG 1994, p. 37 – 44.
Baughman, G.L., Fate of dyes in aquatic systems. Part 3. The role
of suspended sediments in adsorption and reaction of acid and direct
dyes. Dyes Pigm., 1995. 27(3), p. 197-210.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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