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EC number: 485-430-0
CAS number: 923954-49-8
It is assumed that soluble Zinc concentration
from Tin Titanium Zinc oxide is responsibel for the effect to algae. No
effects up to the limit dose were observed to Daphnia and fish.
Due to the fact that the substance is poorly soluble, an eluate
according to OECD 29 was tested in the acute aquatic ecotoxicity tests.
However, to avoid further animal testing, the chronic effects were
investigated by evaluation of the transformation and dissolution of Ti,
Zn and Sn from the substance according to the T/D Protocol (OECD 29)
(transformation/dissolution protocol, see section 4.8 attached). Then,
the transformed metal concentrations from the OECD 29 test were compared
with the chronic Ecotoxicity Reference Values (ERVs). The full chronic
test was performed at 1 mg/L loadings for 28 days and at the pH of
maximum release of the most eco-toxicological relevant metal, i.e. Zn
and Sn at pH 5.5. This is one of the results of the available acute
aquatic ecotoxicity tests.
The chronic Ecotoxicity Reference Values (ERVs) for Zn and Sn was
taken from the REACH dossier of Zn oxide (CAS 1314-13-2) and SnCl2(7772-99-8).
A chronic ERV of 82 µg/L for pH 6-<7 was determined for Zn. The chronic
ERV for Sn is 30 µg/L which is the lowest chronic endpoint determined in
a chronic study with Algae. The third metal Ti is of no ecological
relevance and is thus not considered further.
The maximum Zn concentration was 16.138 µg/L after 336 hours and
was 14.032 µg/L after 672 hours and at a loading rate of 1 mg/L. These
concentrations are far below the chronic ERV of 82 µg/L for pH 6-<7 and
thus no chronic classification has to be applied to the substance
according to GHS.
For Sn, the maximum concentration was 0.724 µg/L after 96 hours
and was 0.331 µg/L after 672 hours and at a loading rate of 1 mg/L.
These concentrations are far below the chronic ERV of 30 µg/L and thus
no chronic classification has to be applied to the substance according
Furthermore, Zinc is considered as equivalent to being ‘rapidly
degradable” in the context of classification for chronic aquatic effects
(> 70 % removal within 28 days from the water column). Furthermore,
bioaccumulation of the essential Zinc is not relevant since it is
actively regulated by organisms (see ECHA disseminates Dosssier; CAS No.
1314 -13 -2).
In conclusion, the results according to the T/D Protocol compared
with the ERVs for the most ecotoxicological relevant metals of the
substance shows that the substance has not to be classified according to
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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