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Diss Factsheets
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EC number: 235-166-5 | CAS number: 12108-13-3
- 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 water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in water: sediment simulation testing
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- Not mentioned
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Methodology similar to OECD 308 with sufficient information presented to assess reliability.
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 308 (Aerobic and Anaerobic Transformation in Aquatic Sediment Systems)
- Deviations:
- yes
- Remarks:
- Aerobic transformation not tested.
- GLP compliance:
- not specified
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material (migrated information):
Not applicable - Radiolabelling:
- no
- Oxygen conditions:
- anaerobic
- Inoculum or test system:
- natural sediment
- Details on source and properties of surface water:
- Not applicable
- Details on source and properties of sediment:
- Sediment samples were obtained from a slow-moving stream (Beaver Dam Creek) located near Athens, Georgia.
For more data, please refer to Table 1. - Details on inoculum:
- no data
- Duration of test (contact time):
- ca. 60 d
- Initial conc.:
- 1 mg/L
- Based on:
- test mat.
- Parameter followed for biodegradation estimation:
- test mat. analysis
- Details on study design:
- Anaerobic reduction: Reduction kinetics were studied using batch methods in anaerobic sediment-water mixture or an aquifer solids-water mixture. Reaction vessels used were 16 x 125 mm borosilicate screw-cap culture tubes sealed with alumnium foil-faced butyl septa. Dry aquifer solids were gently mixed with aqeous mmt solutions of various concentrations at weight ratios of 1:0.8, 1:1 and 1:1.2. Redox potential were monitored with Eh measurements. Reaction mixture vessels were sealed and stored in the dark at 25 ± 2°C.
- Test performance:
- There appeared to be no reaction of mmt in the Beaver Dam bottom sediment after 60 d; no products were observed by GC-MS, and the small loss of mmt was noted to potentially be from experimental error.
- Compartment:
- other: water / sediment, material (mass) balance
- Remarks on result:
- other: Not determined.
- Remarks on result:
- other: Not determined
- Compartment:
- sediment
- Remarks on result:
- other: No half-life was calculated since no biodegradation was observed during the 60 day experimental period.
- Transformation products:
- no
- Details on transformation products:
- No degradation products were observed by GC-MS.
- Evaporation of parent compound:
- not measured
- Volatile metabolites:
- no
- Residues:
- no
- Details on results:
- No biodegradation was observed within the test duration of 60 days.
- Validity criteria fulfilled:
- not specified
- Conclusions:
- mmt can be persistent in natural aquatic environments, like sediments, in the absence of light. No (bio)degradation of mmt occurred during the 60 d exposure period.
- Executive summary:
The study performed was similar to an OECD 308 guideline study. In order to determine anaerobic (bio)degradation of mmt in sediments, samples were collected from a slow-moving stream, Beaver Dam Creek. The sediment samples were exposed to 1 mg/L mmt (1 ppm) for 60 days with the test performed in the dark to prevent photolysis. At the end of the 60 days test period no (bio)degradation was observed, and the calculation of mmt's half-life was not possible. .
Based on the findings, it was determined thsat mmt can be persistent in natural aquatic environments, like sediments, in the absence of light.
Reference
Description of key information
Key value for chemical safety assessment
Additional information
The half-life of mmt was not determined due to the absence of biodegradation during the 60 day exposure period.
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