3,3'-dichlorobenzidine dihydrochloride

Phototransformation in air

Administrative data

Endpoint:

phototransformation in air

Type of information:

migrated information: read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

supporting study

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

other: Secondary litrature

Data source

Reference

Reference Type:

secondary source

Title:

BUA, Beratergremium für umweltrelevante Altstoffe; 3,3´-Dichlrorobenzidin, BUA-Stoffbericht 30, March 1989

Year:

1989

Bibliographic source:

Gesellschaft Deutscher Chemiker, GdCh, Beratergremium für umweltrelevante Altstoffe, BUA, VCH Verlag, Weinheim

Materials and methods

Test material

Test material information

Constituent 1

Reference substance name:

3,3'-dichlorobenzidine

EC Number:

202-109-0

EC Name:

3,3'-dichlorobenzidine

Cas Number:

91-94-1

IUPAC Name:

3,3'-dichlorobiphenyl-4,4'-diamine

Applicant's summary and conclusion

Executive summary:

Concerning the photochemical degradation in air, a reaction constant was calculated for the reaction of the OH-radical with 3,3´-dichlorobenzidine: k_OH = 2 *10 ^-10 cm³ * molecule^-1 * s^-1

With a OH-radical concentration of 5*10⁵ molecules/cm³ a halflife of t_1/2 = 2 hours in the atmosphere is resulting.

An experimental study showed that silca-adsorbed 3,3´-dichlorobenzidine is degraded slower. After 17 hours of irradiation with light of wavelengths > 290 nm 41.2% of the adsorbed substance was photomineralized to CO₂. Volatile organic fragments devoloped to a minor degree (0.1%).