Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 233-162-8 | CAS number: 10049-04-4
Endpoint summary
Administrative data
Description of key information
Chlorine dioxide (CAS 10049-04-4):
Short-term as well as long-term aquatic toxicity tests show that chlorine dioxide is toxic to aquatic organisms.
Short-term tests with fish and invertebrates gave results below 1 mg/L with LC50(96h) and EC50(72h) of 0.021 and 0.063 mg/L, respectively. For long-term test, only NOEC value of 0.02 mg/ was found for algae.
Taking all aquatic data into account on chlorine dioxide, LC50 of 0.021 mg/L on fish was used for PNEC calculations.
Sodium chlorate (CAS 7775-09-9):
Short-term as well as long-term aquatic toxicity tests show that sodium chlorate is not very toxic to aquatic organisms.
Short-term tests with fish and invertebrates, freshwater as well as marine species, gave results greater than 1000 mg/l. For long-term tests with fish and daphnids NOEC values greater than 500 mg/l were obtained.
Algae species (freshwater and marine) were more sensitive, but EC50 values were still greater than 100 mg/l and NOECs were greater than 62.5 mg/l. Lemna minor was most sensitive with a NOEC of 10 mg/l.
Taking all aquatic data into account Lemna minor is most sensitive, with a NOEC of 10 mg/l.
Additional information
Few studies are available on the aquatic toxicity of chlorite (CAS 7758-19-2). In freshwater compartment, studies show toxicity of chlorite with EC/LC50 below 1 mg/L. Acute toxicity of chlorite on algae was assessed with an EC50 of 0.15 mg/L. Chronic toxicity of chlorite on invertebrates was assessed with an EC10 of 0.55 µg/L. In marine water, acute toxicity values available (fish and invertebrates) are above 10 mg/L and chronic toxicity data is above 1 mg/L with a NOEC of 6.9 mg/L on fish.
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.
