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Sediment toxicity

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Waiving of study:
In accordance with column 2 of REACH Annex X, long-term toxicity tests to sediment organisms (required in section 9.5.1) does not need to be conducted 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 on sediment organisms. The log Kow is expected to be < 0 and thus the potential for bioaccumulation is very low. 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-term effects are not expected and consequently long-term toxicity tests to sediment organisms are not necessary.

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