Registration Dossier
Registration Dossier
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EC number: 237-623-4 | CAS number: 13870-28-5
Toxicity to soil microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
Waiving of study:
In accordance with column 2 of REACH Annex X, toxicity to soil microorganisms (required in section 9.4.2) does not need to be conducted for disodium disilicate (delta-crystalline) as the chemical safety assessment indicates no need for a further investigation. 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, effects are not expected and consequently, toxicity testing is not necessary.
Key value for chemical safety assessment
Additional information
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