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In the environment sodium nitrite will dissociate into sodium and nitrite ions. Nitrite ions are a component of the nitrogen cycle. In the environment, bacteria of the genus Nitrobacter oxidise nitrites to nitrates. Nitrates are reduced to nitrogen by anaerobic bacteria present in soil and sediment. In addition, since direct exposure of the soil compartment is unlikely and binding to solid phase (e.g. clay) of sodium nitrite is negligible no test on terrestrial organisms are performed. Therefore, risk assessment will be based on EPM.

 

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