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EC number: 203-604-4 | CAS number: 108-67-8
- 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
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
- Endpoint:
- activated sludge respiration inhibition testing
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: GLP, guideline study, result taken from toxicity control of biodegradation study
- Qualifier:
- according to guideline
- Guideline:
- other: OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material (migrated information):
Not applicable - Analytical monitoring:
- no
- Details on sampling:
- Not applicable
- Vehicle:
- no
- Details on test solutions:
- - Test medium: OECD 301F mineral salts medium
- Test organisms (species):
- other: Mixture of sewage, soil and natural water
- Details on inoculum:
- - Mixed inoculum of the aqueous phase of non-adapted activated sludge and pre-treated, non-adapted standard soil.
- Activated sludge: From the sewage plant at Hildesheim that receives predominantly municipal sewage and hardly any industrial chemical waste. The activated sludge was washed twice with chlorine free tap water. After second washing the settled sludge was resuspended in mineral salts medium and was maintained in an aerobic condition by aeration for 2 hours. Thereafter the sludge was homogenised with a blender. After sedimentation the supernatant was decanted and maintained in aerobic conditions with CO2-free air for 5 days. 10mL/L was used to initiate inoculation.
- Standard soil: Obtained from LUFA at Speyer. It is well suited as it is a certified and field fresh soil established for biodegradation studies. The soil was mixed with mineral salts medium and shaken on an overhead shaker overnight. Subsequently, the soil was allowed to settle for 3 hours and the supernatant was used as inoculum. The supernatant was maintained in an aerobic condition by aeration with CO2 free air until test start. 7mL/L were used to initiate inoculation. - Test type:
- static
- Water media type:
- freshwater
- Limit test:
- yes
- Total exposure duration:
- 28 d
- Post exposure observation period:
- None
- Hardness:
- Not reported
- Test temperature:
- - Temperature: 21.3-21.5°C
- pH:
- - pH: 7.65 at start and 7.87 at end in toxicity control, 7.64 to 7.69 at start and 7.57 to 7.83 at end in the other vessels
- Dissolved oxygen:
- Not applicable
- Salinity:
- Not applicable
- Nominal and measured concentrations:
- - Nominal: 24.2 mg test item/L
- Details on test conditions:
- - Test vessel: 250 mL test solution in 500 mL brown glass bottle fitted with a rubber sleeve with soda lime to absorb evolved CO2. Bottles were closed with OxiTop measuring heads.
- Conditions: Continual stirring in an incubator in the dark
- Observations: Oxygen consumption was measured every 112 minutes. The difference between the test and inoculum control replicates was used to determine the oxygen depletion, with biodegradation calculated as the relation of the BOD to the ThOD. Results were calculated using Sigma Plot SPSS software.
- Toxicity control: 1 replicate of test medium with test and reference item
- Other replicates: 3 for test item degradation, 1 for functional control and 2 for inoculum control (test medium without test or reference item) - Reference substance (positive control):
- yes
- Remarks:
- sodium benzoate
- Key result
- Duration:
- 28 d
- Dose descriptor:
- NOEC
- Effect conc.:
- 24.2 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- inhibition of total respiration
- Remarks:
- respiration rate
- Details on results:
- The toxicity control reached 53% after 14 days and 74% biodegradation after 28 days. The validity criterion that the test item should not inhibit the degradation of the reference item was fulfilled.
- Results with reference substance (positive control):
- Functional control reached the pass level for degradation (>60%) within 3 days and came to a maximum of 89% biodegradation after 28 days.
The first two test item replicates reached the 10% level (beginning of biodegradation) within 12 days and the 3rd test item replicate reached the 10% level on day 15. The 1st test item replicate reached the 60% pass level on day 23 and the 2nd and 3rd test item replicates did not reach the 60% pass level. The mean biodegradation on day 28 was 61% (1st test item replicate was 65% and the 2nd and 3rd test item replicates were 59%). - Reported statistics and error estimates:
- No data reported
- Validity criteria fulfilled:
- not specified
- Remarks:
- Validity criteria of biodegradation study fulfilled
- Conclusions:
- No inhibition of biodegradation was observed in the toxicity control of the biodegradation study. The 28 day NOEC for the toxicity of 1,3,5-trimethylbenzene to a mixture of sewage sludge, soil and water is 24.2 mg test item/L.
- Executive summary:
The toxicity of 1,3,5 -trimethylbenzene to aquatic micro-organisms has been taken from the results for the toxicity control in the biodegradation study. The biodegradation study is GLP compliant and follows OECD guideline 301F, ready biodegradability manometric respiration test. The toxicity control, containing 24.2 mg test item/L and sodium benzoate, showed no inhibition in respiration, reaching 53 % degradation after 14 days and 74 % biodegradation after 28 days, and therefore it is concluded that the test item does not inhibit the degradation of the reference item. The 28 day NOEC is 24.2 mg test item/L, the only concentration tested.
Reference
Description of key information
No inhibition of biodegradation was observed in the toxicity control of the biodegradation study. The 28 day NOEC for the toxicity of 1,3,5-trimethylbenzene to a mixture of sewage sludge, soil and water is 24.2 mg test item/L.
Key value for chemical safety assessment
- EC10 or NOEC for microorganisms:
- 24.2 mg/L
Additional information
The toxicity of 1,3,5 -trimethylbenzene to aquatic micro-organisms has been taken from the results for the toxicity control in the biodegradation study (Dr Noack 2016). The biodegradation study is GLP compliant and follows OECD guideline 301F, ready biodegradability manometric respiration test. The toxicity control, containing 24.2 mg test item/L and sodium benzoate, showed no inhibition in respiration, reaching 53 % degradation after 14 days and 74 % biodegradation after 28 days, and therefore it is concluded that the test item does not inhibit the degradation of the reference item. The 28 day NOEC is 24.2 mg test item/L, the only concentration tested.
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