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EC number: 814-072-3 | CAS number: 77614-79-0
- 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:
- key study
- Study period:
- 07. June 2018 -11. March 2019
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 019
- Report date:
- 2019
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 307 (Aerobic and Anaerobic Transformation in Soil)
- Version / remarks:
- 2002
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 835.4100 (Aerobic Soil Metabolism)
- Version / remarks:
- 2008
- Qualifier:
- according to guideline
- Guideline:
- other: Japanese MAFF Test Guidelines 12 Nousan 8147, No. 2-5-2
- Version / remarks:
- 2008
- GLP compliance:
- yes (incl. QA statement)
- Test type:
- laboratory
Test material
- Reference substance name:
- 3,5-bis(difluoromethyl)-1H-pyrazole
- EC Number:
- 814-072-3
- Cas Number:
- 77614-79-0
- Molecular formula:
- C5H4F4N2
- IUPAC Name:
- 3,5-bis(difluoromethyl)-1H-pyrazole
Constituent 1
- Radiolabelling:
- yes
Study design
- Oxygen conditions:
- aerobic
- Soil classification:
- USDA (US Department of Agriculture)
- Year:
- 2 018
Soil propertiesopen allclose all
- Soil no.:
- #1
- Soil type:
- silt loam
- % Clay:
- 21
- % Silt:
- 60
- % Sand:
- 19
- % Org. C:
- 2.9
- pH:
- 5.2
- CEC:
- 10 meq/100 g soil d.w.
- Bulk density (g/cm³):
- 1
- Soil no.:
- #2
- Soil type:
- sandy loam
- % Clay:
- 11
- % Silt:
- 18
- % Sand:
- 71
- % Org. C:
- 1.7
- pH:
- 6.9
- CEC:
- 8.6 meq/100 g soil d.w.
- Bulk density (g/cm³):
- 1.2
- Soil no.:
- #3
- Soil type:
- silt loam
- % Clay:
- 19
- % Silt:
- 66
- % Sand:
- 15
- % Org. C:
- 2.3
- pH:
- 5.7
- CEC:
- 11.2 meq/100 g soil d.w.
- Bulk density (g/cm³):
- 1.1
- Soil no.:
- #4
- Soil type:
- loam
- % Clay:
- 27
- % Silt:
- 44
- % Sand:
- 29
- % Org. C:
- 5.4
- pH:
- 7.2
- CEC:
- 19.8 meq/100 g soil d.w.
- Bulk density (g/cm³):
- 0.9
- Details on soil characteristics:
- SOIL COLLECTION AND STORAGE (valid for all four soils)
- Geographic location: North Rhine Westphalia / Germany
- Pesticide use history at the collection site: No plant protection products used for previous 5 years
- Collection procedures: Sample taken with shovel and placed in plastic bag
- Sampling depth (cm): 0 -20
- Storage conditions: Stored at ambient temperature prior to use
- Storage length: 9 - 10 days prior to equilibration
- Soil preparation (e.g., 2 mm sieved; air dried etc.): Soils were passed through a 2 mm sieve
PROPERTIES OF THE SOILS (in addition to defined fields)
- Moisture of sieved soil): #1 26.3 g/100 g soil dry weight
#2 12.8 g/100 g soil dry weight
#3 21.9 g/100 g soil dry weight
#4 34.5 g/100 g soil dry weight
Duration of test (contact time)open allclose all
- Soil No.:
- #1
- Duration:
- 120 d
- Soil No.:
- #2
- Duration:
- 28 d
- Soil No.:
- #3
- Duration:
- 120 d
- Soil No.:
- #4
- Duration:
- 91 d
Initial test substance concentrationopen allclose all
- Soil No.:
- #1
- Initial conc.:
- 0.07 mg/kg soil d.w.
- Soil No.:
- #2
- Initial conc.:
- 0.07 mg/kg soil d.w.
- Soil No.:
- #3
- Initial conc.:
- 0.07 mg/kg soil d.w.
- Soil No.:
- #4
- Initial conc.:
- 0.07 mg/kg soil d.w.
- Parameter followed for biodegradation estimation:
- radiochem. meas.
- test mat. analysis
Experimental conditionsopen allclose all
- Soil No.:
- #1
- Temp.:
- 19.5
- Microbial biomass:
- 710 mg microbial carbon per kg soil dry weight at experimental start
- Soil No.:
- #2
- Temp.:
- 19.5
- Microbial biomass:
- 778 mg microbial carbon per kg soil dry weight at experimental start
- Soil No.:
- #3
- Temp.:
- 19.5
- Microbial biomass:
- 950 mg microbial carbon per kg soil dry weight at experimental start
- Soil No.:
- #4
- Temp.:
- 19.5
- Microbial biomass:
- 2424 mg microbial carbon per kg soil dry weight at experimental start
- Details on experimental conditions:
- EXPERIMENTAL DESIGN
- Soil preincubation conditions (duration, temperature if applicable): Equilibration to study conditions for 4 days
- Soil condition: fresh
- Soil (g/replicate): 100 g dry weight equivalents per replicate
- Control conditions, if used (present differences from other treatments, i.e., sterile/non-sterile, experimental conditions): Samples for determination of soil microbial biomass:native soil with and without application solvent
- No. of replication controls, if used: not used
- No. of replication treatments: Duplicate samples for each sampling interval
- Test apparatus (Type/material/volume): 300 mL glass Erlenmeyer flasks
- Details of traps for CO2 and organic volatile, if any: Each test vessel was fitted with a trap attachment (permeable for oxygen) containing soda lime for absorption of carbon dioxide and a polyurethane (PU) foam plug for adsorption of volatile organic compounds (VOC).
- If no traps were used, is the system closed/open: closed system
- Identity and concentration of co-solvent: Acetonitrile 99.5 %
Test material application
- Volume of test solution used/treatment: The total amount of test item was dissolved in 1.75 mL acetonitrile/water (1/1, v/v), resulting in a stock solution with a nominal concentration of 1 mg/mL (3.99 MBq/mL). 952 µL of the stock solution were pipetted into a flask, diluted with 119 mL of acetate buffer pH 4 and sonicated for 5 minutes, resulting in an application solution with a nominal concentration of 7.8 µg/mL (31.2 kBq/mL).
- Application method (e.g. applied on surface, homogeneous mixing etc.): 1000 µL of application solution were applied dropwise evenly distributed using a pipette onto the soil surface of the respective equilibrated test systems.
- Is the co-solvent evaporated: No.
Any indication of the test material adsorbing to the walls of the test apparatus: No.
Experimental conditions (in addition to defined fields)
- Moisture maintenance method: Re-weighing and addition of lost water
- Continuous darkness: Yes
Other details, if any:
OXYGEN CONDITIONS (delete elements as appropriate)
- Methods used to create the aerobic conditions: Trap attachment (permeable for oxygen)
SAMPLING DETAILS
- Sampling intervals: Seven to eleven sampling intervals were distributed over the entire incubation period of 28 days (soil #2), 91 days (soil #4) and 120 days (soils #1 and #4). Duplicate samples were processed and analyzed 0, 1, 3, 7, 10, 14 and 28 days after treatment (DAT) for all soils. Samples of soil #4 were additionally processed 45, 63 and 91 days after treatment while samples of soils #1 and #3 were additionally processed 45, 63, 91 and 120 days after treatment. Microbial soil biomass was determined at start, middle and end of the study (DAT-2 (all soils), DAT-29 (only soil #2), DAT-63 (soils #1, #3 and #4) and DAT-120 (soils #1 and #3)).
- Sampling method for soil samples: Processing of whole replicates.
- Method of collection of CO2 and volatile organic compounds: Collection of CO2 by liberation of CO2 trapped in soda lime using hydrochloric acid
Collection of volatile organic compounds via extraction of the PU plug using 50 mL ethyl acetate
- Sampling intervals/times for:
> Sterility check, if sterile controls are used
> Moisture content: each sampling day
- Sample storage before analysis: The trap attachments containing soda lime and PU foam were stored before processing at ambient temperature in the laboratory for a maximum period of 8 days
The first analyses of soil extracts by LSC and the primary chromatographic method were usually done within three days after sampling. After analysis, soil extracts were stored at < -18 °C in the dark.
The exhaustively extracted soils were dried, homogenized and stored at ambient temperature in the laboratory. For determination of non-extractable residues (NER) by combustion/LSC soils were stored for a maximum period of 19 days. For characterization of soils were stored for a maximum period of 98 days.
- Other observations, if any: No.
Results and discussion
Material (mass) balanceopen allclose all
- Soil No.:
- #1
- % Recovery:
- 98.6
- Soil No.:
- #2
- % Recovery:
- 97.4
- Soil No.:
- #3
- % Recovery:
- 98.6
- Soil No.:
- #4
- % Recovery:
- 98.2
Half-life / dissipation time of parent compoundopen allclose all
- Soil No.:
- #1
- DT50:
- 15.8 d
- Type:
- other: double first order in parallel
- Temp.:
- 19.5 °C
- Soil No.:
- #2
- DT50:
- 3.3 d
- Type:
- other: double first order in parallel
- Temp.:
- 19.5 °C
- Soil No.:
- #3
- DT50:
- 18.6 d
- Type:
- other: double first order in parallel
- Temp.:
- 19.5 °C
- Soil No.:
- #4
- DT50:
- 6.9 d
- Type:
- other: double first order in parallel
- Temp.:
- 19.5 °C
- Transformation products:
- yes
- Remarks:
- 5-(difluoromethyl)-1H-pyrazole-3-carboxylic acid
Identity of transformation products
- No.:
- #1
Reference
- Reference substance name:
- Unnamed
- IUPAC name:
- 5-(difluoromethyl)-1H-pyrazole-3-carboxylic acid
- CAS number:
- 681034-51-5
- Molecular formula:
- C5 H4 F2 N2 O2
- Molecular weight:
- ca. 162.1
- SMILES notation:
- OC(=O)c1cc(nn1)C(F)F
- Details on transformation products:
- The following degradation product was identified by HPLC-MS(/MS) including accurate mass determination as well as by HPTLC co-chromatography after isolation from soil extracts: 5-(difluoromethyl)-1H-pyrazole-3-carboxylic acid
- Evaporation of parent compound:
- no
- Volatile metabolites:
- no
- Residues:
- yes
- Details on results:
- TEST CONDITIONS
- Aerobicity (or anaerobicity), moisture, temperature and other experimental conditions maintained throughout the study: Yes
- Anomalies or problems encountered (if yes): No
MAJOR TRANSFORMATION PRODUCTS
- Range of maximum concentrations in % of the applied amount at end of study period: 42.5 % AR
EXTRACTABLE RESIDUES
Extractable residues decreased from DAT-0 to the last sampling interval from 104 to 12.5% AR at DAT-120 in soil #1, from 103 to 26.3% AR at DAT-28 in soil #2, from 104 to 15.6% AR at DAT-120 in soil #3 and from 103 to 11.8% AR at DAT-91 in soil #4.
NON-EXTRACTABLE RESIDUES
Non-extractable residues (NER) increased from < 0.3% AR at DAT-0 to 35.5% AR at DAT-28 in soil #2 and from 0.5% AR at DAT-0 to 37.6% AR at DAT-91 in soil #4. NER increased in soil #1 from DAT-0 to DAT-91 from 0.3 to 32.4% AR and then further decreased slightly to 30.2% AR at DAT-120. In soil #3, NER increased from DAT-0 to DAT-91 from < 0.3 to 32.0% AR and then further decreased slightly to 30.3% AR at DAT-120
MINERALISATION
- % of applied radioactivity present as CO2 at end of study: The maximum amount of carbon dioxide was 49.7, 29.6, 44.3 and 43.6% AR at the last sampling interval in soil #1, #2, #3 and #4, respectively.
VOLATILIZATION
- % of the applied radioactivity present as volatile organics at end of study: <= 1.8 % AR for all soils at all sampling intervals
Applicant's summary and conclusion
- Conclusions:
- The test item undergoes degradation with mineralization in soil under aerobic conditions in the laboratory in the dark. Besides carbon dioxide, one further degradation product was identified.
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