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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.

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