Registration Dossier

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REACH

Reaction products of diazotised 4,4-diaminodiphenylamine-2-sulfonic acid, subsequently coupled with 6-amino-4-hydroxynaphthalene-2-sulfonic acid, further diazotised and coupled with metaphenylendiamine, sodium salts

EC number: 939-382-7 | CAS number: -

Life Cycle description
Uses advised against

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Phototransformation in air/water/soil has not been investigated because direct and indirect exposure is unlikely, based on CSR and risk management measures reported; the primary source of environmental pollution of Direct Black 22 (DBk22) is represented by industrial waste water and secondary by release during washing of dyed textile, accordingly fototransformation is not a relevant process of which substance undergoes.

Due to the same reasons given above, in the aquatic environment hydrolysis is not expected to be an important process that characterize DBk22. Read across proposed with a similar substance reported that less than 10% of the test substance was hydrolysed within 5 days period. The half-life time of hydrolysis can therefore be expected greater than 1 year at 25°C and that substance is relatively stable in the medium term.

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