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EC number: 617-435-2 | CAS number: 83066-88-0
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Phototransformation in water
Administrative data
Link to relevant study record(s)
- Endpoint:
- phototransformation in water
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 20 April 2009 to 3 May 2013
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Study type:
- direct photolysis
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 316 (Phototransformation of Chemicals in Water - Direct Photolysis)
- Version / remarks:
- October 2008
- Qualifier:
- according to guideline
- Guideline:
- other:
- Version / remarks:
- EPA Test Guideline OPPTS 835.2240, Photodegradation in Water (October 2008)
- GLP compliance:
- yes (incl. QA statement)
- Radiolabelling:
- yes
- Analytical method:
- high-performance liquid chromatography
- other: Liquid scintillation counting (LSC)
- Buffers:
- Buffer solutions (0.02M) at pH 7
- Light source:
- Xenon lamp
- Light spectrum: wavelength in nm:
- >= 300 - <= 400
- Relative light intensity:
- 20.93
- Details on light source:
- - Emission wavelength spectrum: 300-400 nm
- Filters used and their purpose: Hanau Suntest accelerated exposure machines were used as the light source and filtered radiation from a xenon burner to remove light below 290 nm to give ultra-violet and visible light with a spectral distribution close to that of natural sunlight.
- Light intensity at sample and area irradiated: 20.93 Watts/m2
- Relative light intensity based on intensity of sunlight: 25.13 Watts/m2/day - Details on test conditions:
- TEST SYSTEM
- Type, material and volume of test apparatus/vessels: irradiated-Borosilicate glass cuvettes, quartz lids; darkness-Borosilicate glass cuvettes
- Sterilisation method: autoclaving.
- Details of traps for volatile, if any: Vessels with side arms were used for this study in order to trap volatiles. All samples containing radiolabelled test item were equipped with bacterial air filters, polyurethane bungs and two 2M sodium hydroxide traps. Humidified (sterile) air was pulled over the irradiated samples and through the traps.
- Indication of test material adsorbing to the walls of test apparatus: no
TEST MEDIUM
- Volume used/treatment: 80 to 100 μL
REPLICATION
- No. of replicates (dark): 2
- No. of replicates (irradiated): 2
- Duration:
- 35 d
- Temp.:
- 25 °C
- Reference substance:
- yes
- Dark controls:
- yes
- Computational methods:
- - Calculation of molar absorption coefficients: The rate of degradation of fluazifop-P was estimated using KinGUI 1.1 software. The rate of degradation was estimated by fitting single first-order kinetics (SFO) to the data.
- Half-lives or DT50, DT75, and DT90 values and appropriate associated confidence intervals: The degradation times DegT50 and DegT90 (time until 50 or 90% degradation) were calculated by the software from the optimized kinetic parameters. - % Degr.:
- 3.6
- Sampling time:
- 0 d
- Remarks on result:
- other:
- Remarks:
- average % of applied radioactivity of [Pyridinyl-14C]Fluazifop-P for two replicates
- % Degr.:
- 12.5
- Sampling time:
- 3 d
- Remarks on result:
- other: average % of applied radioactivity of [Pyridinyl-14C]Fluazifop-P for two replicates
- % Degr.:
- 16.2
- Sampling time:
- 5 d
- Remarks on result:
- other: average % of applied radioactivity of [Pyridinyl-14C]Fluazifop-P for two replicates
- % Degr.:
- 18.9
- Sampling time:
- 8 d
- Remarks on result:
- other: average % of applied radioactivity of [Pyridinyl-14C]Fluazifop-P for two replicates
- % Degr.:
- 31.8
- Sampling time:
- 15 d
- Remarks on result:
- other: average % of applied radioactivity of [Pyridinyl-14C]Fluazifop-P for two replicates
- % Degr.:
- 51.7
- Sampling time:
- 28 d
- Remarks on result:
- other: average % of applied radioactivity of [Pyridinyl-14C]Fluazifop-P for two replicates
- % Degr.:
- 50.9
- Sampling time:
- 30 d
- Remarks on result:
- other: average % of applied radioactivity of [Pyridinyl-14C]Fluazifop-P for two replicates
- % Degr.:
- 1.2
- Sampling time:
- 35 d
- Remarks on result:
- other: average % of applied radioactivity of [Pyridinyl-14C]Fluazifop-P for two dark control replicates
- % Degr.:
- 0
- Sampling time:
- 0 d
- Remarks on result:
- other: average % of applied radioactivity of [Phenyl-14C]Fluazifop-P for two replicates
- % Degr.:
- 20
- Sampling time:
- 3 d
- Remarks on result:
- other: average % of applied radioactivity of [Phenyl-14C]Fluazifop-P for two replicates
- % Degr.:
- 25.2
- Sampling time:
- 5 d
- Remarks on result:
- other: average % of applied radioactivity of [Phenyl-14C]Fluazifop-P for two replicates
- % Degr.:
- 38
- Sampling time:
- 8 d
- Remarks on result:
- other: average % of applied radioactivity of [Phenyl-14C]Fluazifop-P for two replicates
- % Degr.:
- 54.1
- Sampling time:
- 18 d
- Remarks on result:
- other: average % of applied radioactivity of [Phenyl-14C]Fluazifop-P for two replicates
- % Degr.:
- 67
- Sampling time:
- 21 d
- Remarks on result:
- other: average % of applied radioactivity of [Phenyl-14C]Fluazifop-P for two replicates
- % Degr.:
- 73.2
- Sampling time:
- 35 d
- Remarks on result:
- other: average % of applied radioactivity of [Phenyl-14C]Fluazifop-P for two replicates
- % Degr.:
- 0
- Sampling time:
- 35 d
- Remarks on result:
- other: average % of applied radioactivity of [Phenyl-14C]Fluazifop-P for two dark control replicates
- Key result
- DT50:
- 16.7 d
- Remarks on result:
- other: Photodegradation kinetics (in Days Summer Sunlight (30, 40 and 50°N in Europe and North America) for combined [phenyl-14C] and [pyridinyl-14C]fluazifop-P
- Transformation products:
- yes
- No.:
- #1
- No.:
- #2
- No.:
- #3
- No.:
- #4
- Details on results:
- TEST CONDITIONS
- pH, sterility, temperature, and other experimental conditions maintained throughout the study: Yes
MAJOR TRANSFORMATION PRODUCTS (distinguish between dark and irradiated samples)
- Range of maximum concentrations in % of the applied amount and day(s) of incubation when observed:
[Pyridinyl-14C]Fluazifop-P
- Transformation product #1: 1.8-21.5% of Applied Radioactivity during 0-30 d (DAT) with maximum concentration at DAT 28.
- Transformation product #4: ND-13.4% of Applied Radioactivity during 0-30 d (DAT) with maximum concentration at DAT 28/30.
[Phenyl-14C]Fluazifop-P in pH 7 Buffer
- Transformation product #1: ND-31.4% of Applied Radioactivity during 0-30 d (DAT) with maximum concentration at DAT 21.
- Transformation product #2: ND-12.7% of Applied Radioactivity during 0-30 d (DAT) with maximum concentration at DAT 8.
MINOR TRANSFORMATION PRODUCTS (distinguish between dark and irradiated samples)
[Pyridinyl-14C]Fluazifop-P
- Transformation product #2: 0.7-7.8% of Applied Radioactivity during 0-30 d (DAT) with maximum concentration at DAT 28.
- Transformation product #3: 0.1-1.1% of Applied Radioactivity during 0-30 d (DAT) with maximum concentration at DAT 30.
[Phenyl-14C]Fluazifop-P in pH 7 Buffer
- two unknown transformation products each accounting for < 10% applied radioactivity
TOTAL UNIDENTIFIED RADIOACTIVITY (RANGE) OF APPLIED AMOUNT (distinguish between dark and irradiated samples):
[Pyridinyl-14C]Fluazifop-P
- a total unknown transformation products ranges from 1.0% to 4.9% of Applied Radioactivity during 0-30 d (DAT) with maximum concentration at DAT 30.
[Phenyl-14C]Fluazifop-P in pH 7 Buffer
- two unknown transformation products (A & C) each accounting for < 10% applied radioactivity
- a total other unknown transformation products on the two unknown (A & C) ranges from ND to 23.4% of Applied Radioactivity during 0-30 d (DAT) with maximum concentration at DAT 30. - Validity criteria fulfilled:
- yes
- Executive summary:
Study Design
The aqueous phototransformation of [pyridinyl-14C]fluazifop-P and [phenyl-14C]fluazifop-P was studied at 25 ± 2ºC in sterile aqueous phosphate buffer (pH 7). The initial concentration of fluazifop-P (R156172, the free acid form of fluazifop-P-butyl) was 5 μg ai/mL and samples were continuously irradiated for up to 35 days using light from xenon lamps in Suntest instruments filtered to remove wavelengths below 290 nm. The light intensity of the Suntests was set to give ca 25 W/m2 (300 – 400 nm), which was approximately equivalent to 1 day of UK/US summer sunlight for 24 hours continuous irradiation.
Irradiated test vessels were connected to traps for the collection of carbon dioxide. Samples were analysed at intervals of 0, 3, 5, 8, 15, 28 and 30 days after treatment (DAT) for [pyridinyl-14C]fluazifop-P and 0, 3, 5, 8, 18, 21 and 35 DAT for [phenyl-14C]fluazifop-P. Dark controls were analysed at 35 DAT for both labels.
Results
In the definitive tests, the mean mass balance for the irradiated samples ranged from 96.9 to 103.0% and for the dark controls ranged from 101.9 to 106.1%. Maximum levels of volatile compounds were 3.8% and 15.1% of applied radioactivity for the
pyridinyl label and phenyl label, respectively. The nature of the radioactivity trapped in the sodium hydroxide traps for the [phenyl-14C]fluazifop-P label was confirmed as carbon dioxide by barium carbonate precipitation.
No notable degradation of either radiolabel occurred during the 35 days incubation in the dark. In addition to parent fluazifop-P, four known degradates were identified. There were three degradates present at 10% of applied radioactivity, #1 (up to 31.4% at 21 DAT), #4 (up to 13.4% at 28 and 30 DAT) and R201189 (up to 12.7% at 8 DAT). Parent and these degradates were confirmed by HPLC and TLC co-chromatography with reference standards and by LC-MS.
A number of minor degradates, including #3, were also observed, however levels of individual degradates accounted for < 5% of applied radioactivity, with the exception of an unknown degradate in the phenyl radiolabel samples which occurred at > 5% at one
timepoint only.
The DegT50 value, derived from Single First-Order (SFO) kinetics for both radiolabels and applicable to Europe and North America (latitudes 30°, 40° and 50°), wasca17 days at pH 7.
SFO
DegT50(days)
Chi²
R²
Prob > t
16.7
13.68
0.8338
4.7 x 10-10
Conclusion
Fluazifop-P was extensively degraded under simulated sunlight.
The three main photodegradation products were transformation product #1,#2 and #4. Initial photodegradation resulted in the formation of #2 with further photodegradation to #1. Another route of photodegradation resulted in cleavage of the ring systems and formation of #3 from the pyridinyl ring system and minor degradation products and carbon dioxide from the phenyl ring system. #3 levels remained low (ca 1%) as it underwent rearrangement of the pyridinyl ring system to form #4. Some of the radiolabel in both ring systems was ultimately mineralised to carbon dioxide.
DegT50 value applicable to Europe and North America (latitudes 30°, 40° and 50°) was ca 17 days in pH 7 buffer.
Reference
TABLE 10 A Comparison of the Radioactive Residues in Irradiated pH 7 Buffer Determined by HPLC and TLC after Treatment with [14C]Fluazifop-P
Sample |
Radiolabel |
Timepoint (DAT) |
%AR Analysed |
Technique |
Fluazifop-P |
CGA142110 |
CGA181847 |
SYN546933 |
R201189 |
Origin |
Unknowns |
A214 Ext 1 |
Pyridinyl |
28 |
97.5 |
TLC HPLC |
50.5 48.1 |
1.1 1.2 |
19.0 18.9 |
10.6 16.1 |
5.8 6.5 |
5.8 NA |
ND 3.9 |
A216 Ext 1 |
Pyridinyl |
30 |
92.6 |
TLC HPLC |
44.5 39.6 |
0.7 1.1 |
24.1 23.4 |
7.7 14.1 |
5.0 6.3 |
5.4 NA |
0.7 5.3 |
C7 Ext 1 |
phenyl |
8 |
100 |
TLC TLC* HPLC |
60.9 58.2 59.0 |
NA NA NA |
24.6 22.2 19.1 |
NA NA NA |
8.1 11.3 12.9 |
5.0 6.6 NA |
1.1 0.4 8.0 |
DAT – Experimental Days After Treatment
NA - Not applicable
* TLC performed using 1D TLC system
Description of key information
The aqueous phototransformation of [pyridinyl-14C]fluazifop-P and [phenyl-14C]fluazifop-P
was studied at 25 ± 20C in sterile aqueous phosphate buffer (pH 7). Fluazifop-P was extensively degraded under simulated sunlight with three main photodegradation products. DegT50 value applicable to Europe and North America was ca 17 days in pH 7 buffer.
Key value for chemical safety assessment
- Half-life in water:
- 16.7 d
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