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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Biodegradation in soil

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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.