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Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

In cases where data for potassium chlorate were not available or to support data that were found for potassium chlorate, tests performed with sodium chlorate were used in this dossier. Read across is possible for these two substances, because the toxicity of the test substance is expected to be related to the chlorate ion and not to the sodium or potassium ion.


Both sodium and potassium chlorate almost totally dissociate in water, producing sodium/potassium cations and chlorate anions.


The conclusions drawn for sodium chlorate are also valid for potassium chlorate.


Sodium chlorate is highly soluble in water (95.7 g/100 ml at 20°C). Sodium chlorate in aqueous solutions is known for its chemical stability under environmental conditions. Based on the chemical structure it is expected that sodium chlorate is resistant to hydrolysis and is not photodegradable. Reduction of chlorate has been detected in terrestrial ecosystems, fresh water, marine environment, compost, and aquifers. These findings demonstrate the wide distribution of chlorate-reducing micro-organisms and that chlorate is rapidly biodegradable. 

Additional information