Registration Dossier

Environmental fate & pathways

Phototransformation in air

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Description of key information

The chemical 4-aminoazobenzene-3,4'-disulphonic acid is not persistent in air medium as the half life period of 4-aminoazobenzene-3,4'-disulphonic acid in air is only 1.7 days.

Key value for chemical safety assessment

Half-life in air:
1.7 d

Additional information

The atmospheric oxidation half-life of 4-aminoazobenzene-3,4'-disulphonic acid was estimated using the level III multimedia model. It was estimated that the substance is not persistent in air medium as the half life period of 4-aminoazobenzene-3,4'-disulphonic acid in air is only 1.7 days. This indicates that 4-aminoazobenzene-3,4'-disulphonic acid is rapidly phototransformed in air.The hydroxyl radical reaction rate constant is estimated to be 0.0000000000096 cm3/molecule-sec at 25 degrees C.

Media

Half life

(days)

Percent in Medium

Air

1.7

0%