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Toxicity to terrestrial arthropods

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Waiving of study:
In accordance with column 2 of REACH Annex IX, short-term toxicity to soil arthropods (required in section 9.4.1) does not need to be conducted as the results of the chemical safety assessment do not indicate the need to investigate further the effects of the substance and/or relevant degradation products on terrestrial invertebrates. 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 toxicity to soil arthropods is not expected and consequently, short-term toxicity testing is not necessary.

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