Registration Dossier
Registration Dossier
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EC number: 223-289-7 | CAS number: 3811-04-9
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 1.15 mg/L
- Assessment factor:
- 10
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 1.15 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 115 mg/L
- Assessment factor:
- 10
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 4.14 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 4.14 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 3.83 mg/kg soil dw
- Assessment factor:
- 100
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- PNEC oral
- PNEC value:
- 12.78 mg/kg food
Additional information
Tests performed with sodium chlorate can be used in this dossier, because the toxicity of the test substance is caused by the chlorate ion. In water and soil sodium and potassium are naturally present and the amounts added with the test substance are not considered to have an impact on the total concentration and on the test result, therefore the counter ion present is not relevant for the test result.
All PNECs are based on studies performed with sodium chlorate and on a molecular weight basis converted to potassium chlorate.
Conclusion on classification
The harmonised classification of the substance is Aquatic Chronic 2 according to Annex VI of Regulation (EC) No 1272/2008 (CLP Regulation, ATP01).
This harmonised classification is not in agreement with the data presented in the dossier as the substance should not be classified instead of Aquatic Chronic 2 based on data from the dossier.
- The substance is not readily biodegradable,
- The lowest chronic EC50 value is higher than 1 mg/L (EC50= 15mg/L, Nitzschia closterium, marine algae; see section 6.1.5)
- The lowest chronic EC10/NOEC value is comprised between 1 and 10 mg/L (7d-NOErC = 10 mg/L, aquatic plants:Lemna minor, section 6.1.6)
As the substance is not readily biodegradable and the lowest NOEC is higher than 1 mg/L, the substance should not be classified for aquatic chronic hazard.
A declassification dossier for aquatic chronic 2 for potassium chlorate has been submitted under the registry of CLH intentions to ECHA by Sweden in 2019 : https://echa.europa.eu/registry-of-clh-intentions-until-outcome/-/dislist/details/0b0236e1835aa465
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.
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