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Sediment toxicity

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The high water solubility and very low  vapour pressure indicate that NaOH will be found predominantly in water. In water (including soil or sediment pore water), NaOH is present as the sodium ion (Na+) and hydroxyl ion (OH-), since solid NaOH rapidly dissolves and subsequently dissociates in water (EU RAR, 2007; section 3.1.3, page 24-25). If emitted to surface water, sorption to particulate matter and sediment will be negligible and so it will not accumulate in living tissues. 

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