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EC number: 202-425-9 | CAS number: 95-50-1
Phototransformation in water
Administrative data
- Endpoint:
- phototransformation in water
- Type of information:
- other: BUA report
- Adequacy of study:
- other information
- Reliability:
- other: BUA report
- Rationale for reliability incl. deficiencies:
- other: BUA report
Data source
Referenceopen allclose all
- Reference Type:
- other: BUA report
- Title:
- Unnamed
- Year:
- 1 990
- Reference Type:
- publication
- Title:
- Ein Beitrag zur Photostabilität organischer Umweltchemikalien in Gegenwart von Wasserstoffperoxid in aquatischen Systemen [in German]
- Author:
- Mansour M, Moza PN, Barlas H, Parlar H
- Year:
- 1 985
- Bibliographic source:
- Chemosphere 14, 1469-1474
- Reference Type:
- publication
- Title:
- Photoinduzierte Hydroxylierungsreaktionen organischer Chemikalien in natürlichen Gewässern - Nitrate als potentielle OH-Radikalquellen- [in German]
- Author:
- Russi H, Kotzias D, Korte F
- Year:
- 1 982
- Bibliographic source:
- Chemosphere 11: 1041-1048
- Reference Type:
- publication
- Title:
- Photochemischer Abbau von chlorierten aromatischen Verbindungen durch Sauerstoffspezies in aquatischen Systemen [in German]
- Author:
- Mansour M, Hustert K, Moza PN, Kettrup A
- Year:
- 1 989
- Bibliographic source:
- VDI Berichte Nr. 745: 927-936
Materials and methods
- Principles of method if other than guideline:
- BUA report
- GLP compliance:
- not specified
Test material
- Reference substance name:
- 1,2-dichlorobenzene
- EC Number:
- 202-425-9
- EC Name:
- 1,2-dichlorobenzene
- Cas Number:
- 95-50-1
- Molecular formula:
- C6H4Cl2
- IUPAC Name:
- 1,2-dichlorobenzene
Constituent 1
Results and discussion
Any other information on results incl. tables
BUA report:
Three publications on the phototransformation of 1,2 -dichlorobenzene in water were summarized in the assessment of the BUA report 53 (1990). The reliability of these publications was not assignable because references were only cited as secondary literature.
The photochemical oxidative degradation of o-dichlorobenzene in water was investigated in the presence of hydrogen peroxide on irradiation with light of wavelength > 290 nm and yielded an OH radical reaction rate constant of 3.00 x 10^9 L/(mol*s). Given an estimated OH radical concentration in natural waters of 10^-16 to 10^-17 mol/L, this translates to a half-life of 642 - 6418 hours of sunshine. One cause of the formation of OH radicals in natural waters is photolysis of nitrate ions. Furthermore, a mean OH radical concentration of 5 x 10^-16 mol/L was quoted in water that was sampled at a depth of 8 cm beneath the surface of the river Goldach, a tributary of the Isar in Munich, 440 m above sea level, under cloudless skies in April. This translates to a half-life of 12.8 days, given 10 hours of sunshine per day.
According to the third publication, degradation proceeds via intermediates (chlorobenzene, chlorophenol) as far as mineralization to CO2 and HCl.
Applicant's summary and conclusion
- Conclusions:
- The photochemical oxidative degradation of o-dichlorobenzene in water was investigated in the presence of hydrogen peroxide on irradiation with light of wavelength > 290 nm and yielded an OH radical reaction rate constant of 3.00 x 10^9 L/(mol*s). Given an estimated OH radical concentration in natural waters of 10^-16 to 10^-17 mol/L, this translates to a half-life of 642 - 6418 hours of sunshine.
- Executive summary:
Three publications on the phototransformation of 1,2 -dichlorobenzene in water were summarized in the assessment of the BUA report 53 (1990). The reliability of these publications was not assignable because references were only cited as secondary literature.
The photochemical oxidative degradation of o-dichlorobenzene in water was investigated in the presence of hydrogen peroxide on irradiation with light of wavelength > 290 nm and yielded an OH radical reaction rate constant of 3.00 x 10^9 L/(mol*s). Given an estimated OH radical concentration in natural waters of 10^-16 to 10^-17 mol/L, this translates to a half-life of 642 - 6418 hours of sunshine. One cause of the formation of OH radicals in natural waters is photolysis of nitrate ions. Furthermore, a mean OH radical concentration of 5 x 10^-16 mol/L was quoted in water that was sampled at a depth of 8 cm beneath the surface of the river Goldach, a tributary of the Isar in Munich, 440 m above sea level, under cloudless skies in April. This translates to a half-life of 12.8 days, given 10 hours of sunshine per day.
According to the third publication, degradation proceeds via intermediates (chlorobenzene, chlorophenol) as far as mineralization to CO2 and HCl.
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