1,2,3-trichlorobenzene

Phototransformation in water

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:

study well documented, meets generally accepted scientific principles, acceptable for assessment

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 wavelenghts > 285 nm with and without the presence of acetone as sensitizer.

GLP compliance:

not specified

Test material

Test material information

Constituent 1

Reference substance name:

1,2,3-trichlorobenzene

EC Number:

201-757-1

EC Name:

1,2,3-trichlorobenzene

Cas Number:

87-61-6

Molecular formula:

C6H3Cl3

IUPAC Name:

1,2,3-trichlorobenzene

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-tion^1      [%]	Photoisomerized chlorobenzenes^1 [%]
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 dechlorination^1      [%]	Photoisomerized chlorobenzenes^1 [%]
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)