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The substance is inorganic and 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).

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.