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EC number: 233-162-8
CAS number: 10049-04-4
Chlorine dioxide reacts in aqueous solution rapidly generating chlorite and chlorate as dominant species under normal 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.
Although chlorine dioxide is acutely toxic to invertebrates, its short half-life in the environment following use and the fact that there is no direct release to aquatic systems, means that there is no concern for the aquatic compartment.
A study investigating the effects on reproduction and growth rate in invertebrates is therefore unjustified on the basis of low exposure.
However, one long-term toxicity study valid was found in Sodium chlorite for aquatic invertebrate Daphnia magna (Thomas et al. 2008, GLP according to OECD guideline 211), and one long-term toxicity study valid was found in Sodium chlorate for the same species (Thomas 2004, GLP according to OECD guideline 211).
Chlorine dioxide reacts in aqueous solution rapidly generating chlorite and chlorate as dominant species under normal 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. Based on results from Thomas, EC50 (22 d) and NOEC (22 d) were 64.87 µg/L of Chlorite, and 15.02 µg/L of Chlorite respectively, and for Chlorate NOEC (21 d) > 372.84 mg/L.
In addition, One long-term study (valid without restrictions) is available for the rotifer Brachionus plicatilis with sodium chlorate. This study by Tobiesen (2010b) was performed according to standard guideline with GLP and chemical analysis of the test substance. B. Plicatilis turned out to be the most sensitive marine species with an EC10 of 21 mg/l sodium chlorate.
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