Registration Dossier

Diss Factsheets

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

In a repeated dose toxicity study, the NOAEL in turkey after repeated oral administration of sodium metasilicate over 4 weeks was greater than 270 ppm Si (Read across to sodium metasilicate). Other terrestrial toxicity studies were not available.

Waiving of other terrestrial toxicity studies:

In accordance with column 2 of REACH Annex IX, short and long-term toxicity to soil macro-organisms (required in section 9.4.1and 9.4.4) can be waived as the results of the chemical safety assessment do not indicate the need to further investigate the effects of the substance and/or relevant degradation products. The log Kow is expected to be < 0 and thus the potential for bioaccumulation is very low. The substance has no high potential to adsorb to soil and is not very persistent. In addition it was shown that disodium disilicate (delta-crystalline) is hydrolysed to water glass in aqueous solution which is identical to silicate. Therefore, it can be concluded that disodium disilicate (delta-crystalline) is hydrolytically degraded to a naturally occurring substance which is widespread in nature. In addition the concentration related silicate-release of disodium disilicate (delta-crystalline) is not expected to be significantly higher than natural fluctuations in silicate levels. Thus, long- and short-term effects on soil macroorganisms are not expected and consequently, short- and long term toxicity testing is not necessary.

Categories Display