Registration Dossier
Registration Dossier
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EC number: 268-612-2 | CAS number: 68131-30-6 A solution obtained by dissolving the chemicals recovered in the alkaline pulping process in water.
Oxidising properties
Administrative data
Link to relevant study record(s)
Description of key information
The molecular/ionic structure of GL and its constituents do not indicate the presence of highly oxidizing constituents or remarkable oxidizing potential.
Key value for chemical safety assessment
- Oxidising properties:
- no
Additional information
Green liquor contains constituents which have some potential for (spontaneous) oxidation-reduction reactions in aquatic solutions. These includes sulfides (S2-), sulfites (SO3-). However, these constituents cannot be regarded as highly reactive or highly unstable groups in aquatic solutions. Sulfite may undergo oxidation and reduction reactions and it can be regarded as a relatively weak oxidiser. Sulfides are reducing agents and therefore Green liquor is rather a reducing substance than oxidizing. The concentration of sulfite in Green liquor may reach 10 % and normally sulfide concentration dominates the overall reduction potential of Green liquor.
Justification for classification or non-classification
Green liquor is always manufactured as an aqueous solution of alkaline inorganic salts and none of these salts, in wet or dry form, are classifiable as oxidizing according to the C&L rules. According to the test guideline A.21 the test need not be performed when examination of the structural formula establishes beyond reasonable doubt that the substance is incapable of reacting exothermically with a combustible material.
The molecular/ionic structure of GL and its constituents do not indicate the presence of highly oxidizing constituents or remarkable oxidizing potential.
The known structure does not indicate that GL presents a danger of oxidation and to increase the burning rate or burning intensity of a combustible substance (cellulose), or to form a mixture with a combustible substance which spontaneously ignites under the conditions of the test as described in Test Guideline A.21 Oxidising properties (liquids) of the EC Regulation No 440/2008.
For Green Liquor, danger of oxidative properties is not a concern and no classification is needed.
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