Registration Dossier
Registration Dossier
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EC number: 304-802-4 | CAS number: 94279-56-8
Bioaccumulation: aquatic / sediment
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
The substance reacts with water. The water soluble reaction product is a multi-constituent substance:
Reaction mass of disodium metasilicate and sodium hydroxide(EC 910-245-3)
Sodium Hydroxide: Source - the sodium hydroxide summary risk assessment report JRC EC 2008
In water (including soil or sediment pore water), NaOH is present as the sodium ion (Na+) and hydroxyl ion (OH-), as solid NaOH rapidly dissolves and subsequently dissociates in water. If emitted to soil, sorption to soil particles will be negligible. Depending on the buffer capacity of the soil, OH- will be neutralised in the soil pore water or the pH may increase.
Bioaccumulation in organisms is not relevant for NaOH.
Silicates:
Toxicokinetic data on vertebrates revealed a low potential for bioaccumulation. Ingested soluble silicates are excreted via urine and to a lesser extent via the faeces. Markedly increased and rapid urinary excretion of silica was observed when soluble sodium silicates were administered to rats (Benke & Osborn 1979), dogs (King et al. 1933), cats (King & McGeorge 1938) and guinea pigs (Sauer et al. 1959). The urinary silicon excretion half-life after administration of sodium silicate to rats via stomach tube was 24 h (Benke & Osborn 1979).
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