Registration Dossier
Registration Dossier
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EC number: 217-617-8 | CAS number: 1912-24-9
Phototransformation in water
Administrative data
- Endpoint:
- phototransformation in water
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- from 14 June 1993 to 27 may 1994
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: GLP study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 994
- Report date:
- 1994
Materials and methods
- Study type:
- direct photolysis
Test guideline
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Aqueous solutions of atrazine and an actinometer were subjected to artificial light from a xenon arc lamp while under constant temperature at 25°C. Solutions of atrazine and actinometer were also maintained in the dark to act as controls. At six time-points subsamples were removed from the test solutions and analysed via HPLC to monitor any decrease in test substance concentration. The use of an actinometer was necessary to calculate the quantum yield
- GLP compliance:
- yes
Test material
- Reference substance name:
- Atrazine
- EC Number:
- 217-617-8
- EC Name:
- Atrazine
- Cas Number:
- 1912-24-9
- Molecular formula:
- C8H14ClN5
- IUPAC Name:
- 6-chloro-N2-ethyl-N4-(propan-2-yl)-1,3,5-triazine-2,4-diamine
- Details on test material:
- Batch n. C103330. CH20512
Purity: 99.9%
Expiry May 1996
Appaerance: white powder
Storage conditions: room temperature
Constituent 1
Study design
- Radiolabelling:
- no
- Analytical method:
- high-performance liquid chromatography
- Light source:
- Xenon lamp
- Light spectrum: wavelength in nm:
- 290 - 500
Duration of test at given test condition
- Duration:
- 10 d
- Temp.:
- 25 °C
- Initial conc. measured:
- 15.323 other: µg/ml
Results and discussion
Spectrum of substance
- Parameter:
- epsilon 295 nm
- Value:
- 85.1 L/(mol cm)
% Degradation
- % Degr.:
- 39
- Sampling time:
- 5 d
- Test condition:
- preliminary test
- Transformation products:
- not measured
Any other information on results incl. tables
The quantum yield for direct photodegradation was established as 1.0585 x 10^-4.
the calculated rate costant of atrazine has need estimated as 0.08732 days^-1
Applicant's summary and conclusion
- Validity criteria fulfilled:
- not specified
- Conclusions:
- Atrazine has been found to photodegrade in the Suntest apparatus with a half-life time of 7.9 days. The quantum yield for direct photodegradation was established as 1.0585 x 10^-4. Using published tables of irradiance values, an environmental half-life time for atrazine of 29 days was obtained for surface waters at latitude 40 - 50°N.
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