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Sediment toxicity

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Description of key information

Chlorine dioxide reacts rapidly in aqueous solution degrading to chlorite and chlorate as dominant species under environmental conditions. In the absence of oxidisable substances, and in the presence of pH > 9, chlorine dioxide dissolves in water and decomposes with the slow formation of chlorite and chlorate ions.

Key value for chemical safety assessment

Additional information

According to the TNsG on Data Requirements for Active Substances and Biocidal Products, and REACH Guidance, a study on the effects on sediment dwelling organisms might be required if exposure is possible. The direct exposure of sediment-dwelling organisms to chlorine dioxide is highly unlikely. Therefore, a study on the effects on sediment dwelling organisms is not required.

Chlorite may be released to the receiving water during discharge of effluent. However, as adsorptivity to sediment is extremely low, and abiotic degradation of chlorite is expected to be high, the concentration of chlorite in sediment will be lower than that in the pelagic compartment. For this reason, it is considered that the partition equilibrium method can be used to determine the risk to the sediment compartment and an in vivo sediment study is not necessary. Chlorine dioxide react easily and rapidly generating chlorite and chlorate as dominant species. In the absence of oxidisable substances, and in the presence of pH > 9, chlorine dioxide dissolves in water and decomposes with the slow formation of chlorite and chlorate ions.

No key studies valid were found in chlorite and chlorate for evaluated the toxicity of sediment.

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