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Environmental fate & pathways

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A read-across approach is considered between sodium chlorate (source) and potassium chlorate (target) because the toxicity of the test substance is expected to be related to the chlorate ion and not to the sodium or potassium ion. The conclusions drawn for sodium chlorate are also valid for potassium chlorate.

Sodium chlorate in aqueous solutions is known for its chemical stability under environmental conditions (hydrolytic stable) (Urbanski 1998) and it is rapidly biodegradable under anaerobic conditions. 

Based on the chemical structures it is expected that both substances, sodium and potassium chlorate, are resistant to hydrolysis and are considered as stable in sterile water whatever the pH is. There are no relevant metabolites, degradation or reaction products that necessitate studies to answer this point.

Studies on the hydrolysis as a function of the pH are therefore not required.

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