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EC number: 233-162-8
CAS number: 10049-04-4
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.
According to REACH Guidance, a soil biodegradation test is required. Three routes of entry to the soil compartment are possible: via deposition of manure, deposition of aerosols from cooling towers or via deposition of sewage sludge (from or not cooling tower or slimicide use). As described in the data waiver for anaerobic degradation, the active substance, chlorine dioxide is highly reactive and it will readily react with organic matter and microorganisms present in manure, in sewage sludge or in soil, and will be reduced to chloride via the transient intermediate chlorite. The ESD for disinfection of animal houses assumes that up to six disinfection treatments are performed during a year, with the manure itself being stored for a total of one year prior to use. On this basis there will be sufficient contact time between the chlorine dioxide and the manure to ensure that complete degradation to chloride ion occurs. Hence there will be no exposure to soil via manure. With regards to exposure via sewage sludge, the vast quantity of organic matter and metal ions dissolved in the aqueous phase in the STP would ensure the complete conversion of chlorine dioxide to chloride via the transient intermediate chlorite. Hence there will be no exposure to soil via sewage sludge. Chlorite in aerosols deposited in soil would also be expected to degrade to chloride on contact with soil. Therefore, a soil biodegradation study is unjustified on the basis of no exposure.
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 study valid was found in chlorite for soil biodegradation but one supporting study valid was found in sodium chlorate for evaluated soil biodegradation (Van der Togt and Van Ginkel 2004, OECD Guideline 307). This study shows a DT50 of 39 to 58 days depending on soil type.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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