Registration Dossier

Administrative data

Endpoint:
phototransformation in water
Type of information:
experimental study
Adequacy of study:
other information
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: acceptable, well documented publication which meets basic scientific principles

Data source

Reference
Reference Type:
publication
Title:
Environmentally significant photochemistry of chlorinated benzenes and their derivatives in aquatic systems
Author:
Choudhry GG et al.
Year:
1986
Bibliographic source:
Toxicological and Environmental Chemistry, Vol., 13, pp. 27-83

Materials and methods

Study type:
other: direct photolysis and indirect photolysis with sensitizer
Principles of method if other than guideline:
Photochemical reactions in various solvents, namely, CH3OH and CH3CN-H2O mixtures were studied at wave lenght > 285 nm with and without the presence of acetone as sensitizer.
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent

Study design

Analytical method:
gas chromatography
Light source:
other: 16 RPR 3000 Å lamp
Light spectrum: wavelength in nm:
>= 290 - <= 310
Sensitiser (for indirect photolysis)
Type of sensitiser:
other: acetone
Concentration of sensitiser:
0.55 other: mol/l

Results and discussion

Any other information on results incl. tables

Reductive dechlorination is the principal photolytic route in both types of photolyses (direct and indirect [sensitizer]).

Table 1: Direct photolysis of polychlorobenzenes (PCBzs) in acetonitrile-water mixtures

Chlorobenzene

Concentration

[mM]

CH3CN:H2O

[V/V]

Irradiatiotime

 [h]

Loss of Starting Material [%]     

Reductively dechlorina-tion1      [%]

Photoisomerized chlorobenzenes1

[%]

1,2,3-trichloro-benzene

5.1

1:1

51

27.8

9.8 %-1,2-dichloro-benzene

22.9 %- 1,3-dichlorobenzene

4.9 % -1,4-dichlorobenzene

8,5 %- 1,2,4-trichlorobenzene

1e.g. 1,2-dichlorobenzene with 9.8 % chemical yield is formed.

 

Table 2: Acetone-sensitized (0.55 M) photolysis of polychlorobenzenes (PCBzs) in acetonitrile-water mixtures

Chlorobenzene

Concentration

[mM]

CH3OH:H2O

[V/V]

Irradiatiotime

 [h]

Dissappearance of Starting Material [%]     

Reductively dechlorination1      [%]

Photoisomerized chlorobenzenes1

[%]

1,2,3-trichloro-benzene

5.18

1:1

15

24.7

7.6 %-1,2-dichloro-benzene

91.4 %- 1,3-dichlorobenzene

-

1e.g. 1,2-dichlorobenzene with 7,6 % chemical yield is formed (calculated basing upon the disappeared starting chlorobenzene)

Applicant's summary and conclusion