Registration Dossier
Registration Dossier
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EC number: 231-197-3 | CAS number: 7446-11-9
Oxidising properties
Administrative data
Link to relevant study record(s)
- Endpoint:
- oxidising liquids
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- other:
- Interpretation of results:
- GHS criteria not met
Reference
Description of key information
Sulphur dioxide does not contain chemical groups associated with oxidising properties. The sulphur atom in sulphuric acid and its salts, has the oxidation number +6. Sulphurous acid (H2SO3) contains sulphur with the oxidation number +4; it has reducing properties and is readily oxidised to sulphuric acid. This behavior is reflected in the electrochemical potential: SO4 2- + H2O + 2 e -> SO3 2- + 2 OH - E = -0,92 V. The UN O.2 test, as described in the UN Manual of Tests and Criteria is based on the reaction of a test compound towards cellulose in comparison to a reference oxidiser. SO3 is the anhydride of sulphuric acid. It is strongly hygroscopic and also acts like an agressive sulfonating agent. SO3 would react exothermally with cellulose. The reaction is not an oxidation but rather a sulfonation and desiccation. Thus, SO3 does not behave like an oxidiser and should not be classified as such.
Key value for chemical safety assessment
- Oxidising properties:
- non oxidising
Additional information
Justification for classification or non-classification
Sulphur trioxide does not behave like an oxidiser and should not be classified as such.
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