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EC number: 610-962-9 | CAS number: 5311-05-7
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Biodegradation in soil
Administrative data
- Endpoint:
- biodegradation in soil: simulation testing
- Type of information:
- experimental study
- Adequacy of study:
- other information
- Study period:
- not specified
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- secondary literature
Data source
Referenceopen allclose all
- Reference Type:
- other: Draft Renewal Assessment Report under Regulation (EC) 1107/2009
- Title:
- Draft Renewal Assessment Report under Regulation (EC) 1107/2009 - Tritosulfuron
- Year:
- 2 018
- Bibliographic source:
- Draft Renewal Assessment Report under Regulation (EC) 1107/2009
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 003
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- EPA OTS 796.3400 (Soil Biodegradation)
- Version / remarks:
- The study setup is in line with current guidance.
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- EPA OPPTS 835.3300 (Soil Biodegradation)
- Version / remarks:
- The study setup is in line with current guidance.
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 304 A (Inherent Biodegradability in Soil)
- Version / remarks:
- The study setup is in line with current guidance.
- GLP compliance:
- yes
- Test type:
- laboratory
Test material
- Reference substance name:
- 4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-amine
- EC Number:
- 610-962-9
- Cas Number:
- 5311-05-7
- Molecular formula:
- C5H5F3N4O
- IUPAC Name:
- 4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-amine
Constituent 1
- Radiolabelling:
- yes
Study design
- Soil classification:
- other: According to DIN 19682
Soil propertiesopen allclose all
- Soil no.:
- #1
- Soil type:
- loamy sand
- % Clay:
- 8
- % Silt:
- 18
- % Sand:
- 74
- % Org. C:
- 0.55
- pH:
- 5.8
- CEC:
- 6.1
- Bulk density (g/cm³):
- 1 629
- % Moisture content:
- 21.68
- Soil no.:
- #2
- Soil type:
- silty clay loam
- % Clay:
- 14.9
- % Silt:
- 39.6
- % Sand:
- 45.5
- % Org. C:
- 0.57
- pH:
- 7.4
- CEC:
- 10.9
- Bulk density (g/cm³):
- 1 739
- % Moisture content:
- 26.15
- Soil no.:
- #3
- Soil type:
- clay loam
- % Clay:
- 41
- % Silt:
- 36.3
- % Sand:
- 22.8
- % Org. C:
- 2
- pH:
- 6.8
- CEC:
- 18
- Bulk density (g/cm³):
- 1 233
- % Moisture content:
- 32.11
Duration of test (contact time)open allclose all
- Soil No.:
- #1
- Duration:
- >= 0 - <= 120 d
- Soil No.:
- #2
- Duration:
- >= 0 - <= 120 d
- Soil No.:
- #3
- Duration:
- >= 0 - <= 120 d
Initial test substance concentrationopen allclose all
- Soil No.:
- #1
- Initial conc.:
- 0.05 g/kg soil d.w.
- Based on:
- other: Representation of the actual use rate of AMTT (50 g/ha, being roughly equivalent to 50 µg/kg dry soil)
- Soil No.:
- #2
- Initial conc.:
- 0.05 g/kg soil d.w.
- Based on:
- other: Representation of the actual use rate of AMTT (50 g/ha, being roughly equivalent to 50 µg/kg dry soil)
- Soil No.:
- #3
- Initial conc.:
- 0.05 g/kg soil d.w.
- Based on:
- other: Representation of the actual use rate of AMTT (50 g/ha, being roughly equivalent to 50 µg/kg dry soil)
- Parameter followed for biodegradation estimation:
- CO2 evolution
- radiochem. meas.
Experimental conditionsopen allclose all
- Soil No.:
- #1
- Temp.:
- 20 ± 2 °C
- Humidity:
- max. 40 %
- Microbial biomass:
- 12.2
- Soil No.:
- #2
- Temp.:
- 20 ± 2 °C
- Humidity:
- max. 40 %
- Microbial biomass:
- 12.9
- Soil No.:
- #3
- Temp.:
- 20 ± 2 °C
- Humidity:
- max. 40 %
- Microbial biomass:
- 19.5
- Details on experimental conditions:
- The soils were freshly sampled at the field site, air-dried and screened trough a 2 mm-sieve. Determination of soil moisture was carried out by differential weighing after drying of 10 g aliquots of each soil in a microwave oven. Thereafter, 100 g of dry soil equivalents were weighed into each 300 mL-Erlenmeyer flask. The soil moisture in each test vessel was adjusted to about 40 % of the maximum water holding capacity of the soil.
Afterwards, the vessels were closed with a cotton wool stopper and pre-incubated at 20 ± 2 °C in the dark for 14 days.
Application and incubation of test system
The initial concentration of AMTT was chosen as 5 µg/100 g dry soil, as to represent the actual use rate of AMTT (50 g/ha, being roughly equivalent to 50 µg/kg dry soil) and 100 % degradation of the parent compound to AMTT. No molecular weight correction factor was used.
AMTT was added to each test vessel individually by pipetting the appropriate amount of an aqueous application solution in small drops onto the soil surface. The actual weight of each test vessel was recorded.
Afterwards the test vessels were closed with a trap attachment (containing soda lime and oil wetted quartzwool) which allowed for some gas exchange but which adsorbed all volatile metabolites (including CO2). Samples were incubated for 0 (1 hour), 1, 3, 7, 14, 30, 62, 90 and 120 days at a temperature of 20 °C and a soil moisture of about 40 % of the respective soils’ maximum water holding capacity.
Results and discussion
Material (mass) balanceopen allclose all
- Soil No.:
- #1
- Sampling day(s):
- 0 d
- % Total extractable:
- 94.41
- % Non extractable:
- 1
- % CO2:
- 0
- % Recovery:
- 95.41
- Soil No.:
- #1
- Sampling day(s):
- 120 d
- % Total extractable:
- 38.69
- % Non extractable:
- 9.67
- % CO2:
- 46.42
- % Recovery:
- 94.78
- Soil No.:
- #2
- Sampling day(s):
- 0 d
- % Total extractable:
- 93.87
- % Non extractable:
- 1.42
- % CO2:
- 0
- % Recovery:
- 95.29
- Soil No.:
- #2
- Sampling day(s):
- 120 d
- % Total extractable:
- 58.2
- % Non extractable:
- 15.21
- % CO2:
- 17.22
- % Recovery:
- 90.63
- Soil No.:
- #3
- Sampling day(s):
- 0 d
- % Total extractable:
- 91.56
- % Non extractable:
- 1.8
- % CO2:
- 0
- % Recovery:
- 93.36
- Soil No.:
- #3
- Sampling day(s):
- 120 d
- % Total extractable:
- 64.09
- % Non extractable:
- 18.71
- % CO2:
- 16.05
- % Recovery:
- 98.85
% Degradationopen allclose all
- Soil No.:
- #1
- % Degr.:
- 89.9
- Parameter:
- radiochem. meas.
- Soil No.:
- #2
- % Degr.:
- 79.5
- Parameter:
- radiochem. meas.
- Soil No.:
- #3
- % Degr.:
- 58.6
- Parameter:
- radiochem. meas.
Half-life / dissipation time of parent compoundopen allclose all
- Soil No.:
- #1
- DT50:
- 35.3 d
- Temp.:
- 20 °C
- Remarks on result:
- other: The kinetic calculations was done with ModelMaker 4.0
- Soil No.:
- #2
- DT50:
- 53.9 d
- Temp.:
- 20 °C
- Remarks on result:
- other: The kinetic calculations was done with ModelMaker 4.0
- Soil No.:
- #3
- DT50:
- 94.5 d
- Temp.:
- 20 °C
- Remarks on result:
- other: The kinetic calculations was done with ModelMaker 4.0
Applicant's summary and conclusion
- Conclusions:
- DT50 values for aerobic degradation of AMTT in soil are:
- weakly loamy sand (Birkenheide) 35.3 days
- silty clayey sand (Mussbach) 53.9 days
- clayey loam (Lufa S6) 94.5 days - Executive summary:
The test item was degraded under the actual incubation conditions. At the end of the incubation period, 10.1 %, 20.5 % and 41.4 % of the applied radioactivity were assigned to unchanged AMTT for the soils Birkenheide, Mussbach and Lufa 6S, respectively. Different non-identified metabolite zones were determined, amounting to 28.6 % of the applied radioactivity after 120 days incubation in soil Birkenheide, 37.7 % in soil Mussbach and 22.7 % in soil Lufa 6S, respectively. For all three soils a decrease of the portion of non-identified radioactivity was observed between 90 and 120 days.
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