Registration Dossier
Registration Dossier
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EC number: 234-126-4 | CAS number: 10544-72-6
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- no hazard identified
Marine water
- Hazard assessment conclusion:
- no hazard identified
STP
- Hazard assessment conclusion:
- no hazard identified
Sediment (freshwater)
- Hazard assessment conclusion:
- insufficient hazard data available (further information necessary)
Sediment (marine water)
- Hazard assessment conclusion:
- insufficient hazard data available (further information necessary)
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- no exposure of soil expected
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
When appropriate the information contained within this section is read across to the Lead Registrants dossier for nitric acid (EC # 231-714-2).
Justification:
In water, dinitrogen tetraoxide (EC 234-126-4) will decompose to nitrous acid and nitric acid, and the aquatic toxicity should be equal to the water concentrations of these substances due to the decomposition of the actual concentrations of dinitrogen tetraoxide. (European Commission). Nitrous acid molecules then combine to produce nitric acid, nitric oxide and water.
The overall reaction can be written as follows:
3 N2O4 + 2 H2O = 4 HNO3 + 2 NO
This reaction is known to be rapid (Masteller & Berman), with Larkin having made calculations assuming an instantaneous rate of reaction between dinitrogen tetraoxide and water.
It is therefore considered appropriate to read across to nitric acid (EC 231-714-2).
References:
1. European Commission, ESIS (2000) IUCLID Dataset, Dinitrogen tetraoxide (CAS #10544-72-6) p.10 (CD-Rom edition).
2. Masteller, R.D. & Berman, L.D. (1964) Evaluation of the Mechanism of Corrosion in Capillaries, Status report #1, Oxidiser Diffusion Studies DRS S 11047, ME #531. U.S. Department of Defense.
In addition to the fact that the substance is not classified for the environment, direct or indirect exposure to the aquatic, including STP, sediment or soil compartments is unlikely as the substance is a gas.
Conclusion on classification
According to Regulation (EC) 1272/2008 based upon the available aquatic toxicity data and environmental fate data the substance is not considered to be classified for the environment.
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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