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Diss Factsheets
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EC number: 219-006-1 | CAS number: 2312-35-8
- 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
Phototransformation in soil
Administrative data
Link to relevant study record(s)
- Endpoint:
- phototransformation in soil
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- not reported
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Remarks:
- The study report contains some missing information due to the poor quality of printing/copying and so cannot be considered reliable without restrictions.
- Qualifier:
- according to guideline
- Guideline:
- EPA Guideline Subdivision N 161-3 (Photodegradation Studies on Soil)
- Deviations:
- no
- GLP compliance:
- yes
- Radiolabelling:
- yes
- Analytical monitoring:
- yes
- Analytical method:
- high-performance liquid chromatography
- Light source:
- Xenon lamp
- Relative light intensity:
- 600 - 650
- Duration:
- 15 d
- Key result
- DT50:
- 37.45 d
- Test condition:
- continuous irradiation
- Transformation products:
- yes
- No.:
- #1
- Validity criteria fulfilled:
- not specified
- Conclusions:
- Under the conditions of the test, propargite degrades moderately slowly under photolytic conditions in soil (DT50 37.5 days continuous irradiation) for form TBPC. This pathway also occurred in the dark controls, indicating that the route of photolytic degradation is the same as for aerobic degradation under dark conditions.
- Executive summary:
Omite® was found to have a half-life of 899 hours (37.45 days) relative to the dark control under continuous irradiation at 25 ºC on the surface of sandy loam soil. This is equivalent to 1798 hours or 74.9 days of 12 hour photocycle. The rate constant relative to the dark control is calculated to be -6.3 x 10-4/day. One major photoproduct was detected and identified by cochromatography as being Omite glycol ether. Soil binding played a significant role in the breakdown of 14C-Omite on soil; some of the degradation observed in this study is not attributable to photodegradation. Roughly 6 % of material applied to photolysis samples was considered unextractable after 15 days; this figure was closed to 4 % for dark control samples.
Reference
Table 1: Average degradation results (as percentage of applied radioactivity)
Time (day) | Propargite | TPBC (glycol ethyer) |
Irradiated | ||
0 | 89.44 | 4.25 |
2 | 81.64 | 6.57 |
5 | 76.78 | 8.45 |
9 | 70.52 | 10.08 |
12 | 73.60 | 12.16 |
15 | 58.62 | 20.34 |
Dark controls | ||
0 | 91.37 | 3.46 |
2 | 81.93 | 5.31 |
5 | 86.97 | 6.77 |
9 | 81.23 | 5.24 |
12 | 86.10 | 5.24 |
15 | 75.37 | 15.55 |
Mass balance = 86.2 to 105.1 %
Description of key information
Half-life in soil was determined to be 899 hours; study conducted in accordance with EPA Guideline, Subdivision N, 161-3; Korpalski (1990)
Key value for chemical safety assessment
- Half-life in soil:
- 899 h
Additional information
Omite®was found to have a half-life of 899 hours (37.45 days) relative to the dark control under continuous irradiation at 25 ºC on the surface of sandy loam soil. This is equivalent to 1798 hours or 74.9 days of 12 hour photocycle. The rate constant relative to the dark control is calculated to be -6.3 x 10-4/day. One major photoproduct was detected and identified by cochromatography as being Omite glycol ether. Soil binding played a significant role in the breakdown of 14C-Omite on soil; some of the degradation observed in this study is not attributable to photodegradation. Roughly 6 % of material applied to photolysis samples was considered unextractable after 15 days; this figure was closed to 4 % for dark control samples.
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