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EC number: 261-675-7 | CAS number: 59231-37-7
- 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
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
- Study period:
- 22/4/2017 to 22/6/2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 209 (Activated Sludge, Respiration Inhibition Test (Carbon and Ammonium Oxidation))
- Version / remarks:
- 22/7/2010
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Specific details on test material used for the study:
- Name: Isodecyl 3,5,5-trimethylhexanoate / Wickenol 152
Batch number: P7560
Purity: 100%
Molecular Formula: C19H38O2
Molecular Weight: 298.50 g/mol
Receipt date: 1 March 2017
Retest /Expiry date: 1 December 2018
Storage: Room temperature - Analytical monitoring:
- yes
- Details on sampling:
- The validity of the test system was checked by inclusion of a series of preparations which contained 3,5-dichlorophenol (3,5-DCP), a standard respiration inhibitor reference. The concentrations used were 0.1, 2.0 and 40 mg/L.
The test substance was insufficiently soluble to permit addition via aqueous solution. Individually weighed quantities of test substance were added to the appropriate test vessels. The range-finder/limit test vessels, were prepared at concentrations of 1, 10, 100 and 1000 mg/L. Two aliquots of each vessel were used as individual replicates for respiration assessments and three at the highest (1000 mg/L level concentration). Immediately after preparation, the pH of each vessel was determined. - Vehicle:
- no
- Details on test solutions:
- The test substance was insufficiently soluble to permit addition via aqueous solution. Individually weighed quantities of test substance were added to the appropriate test vessels. The range-finder/limit test vessels, were prepared at concentrations of 1, 10, 100 and 1000 mg/L. Two aliquots of each vessel were used as individual replicates for respiration assessments and three at the highest (1000 mg/L level concentration). Immediately after preparation, the pH of each vessel was determined.
- Test organisms (species):
- activated sludge of a predominantly domestic sewage
- Details on inoculum:
- Synthetic Sewage
A synthetic sewage concentrate was used to feed the activated sludge during storage and to provide a uniform respiration substrate in the test cultures. Packets of pre-made synthetic sewage from Strathkelvin were added to water (1 packet per 250 mL of water). Batch number 2/01 was used throughout the study.
Activated Sludge Inoculum
The activated sludge inoculum was collected from the sludge return line at Burley Menston sewage treatment works (West Yorkshire, UK), which has a predominantly domestic catchment. The point of collection was to ensure that the activated sludge sample was relatively free of exogenous material.
Preparation and Maintenance
The sludge was transported to the test facility in a closed container with an adequate headspace to prevent the sample becoming anoxic. On arrival at the test facility, the sludge was aerated with a compressed air supply delivered through a suitable distribution device.
The suspended solids concentration was determined gravimetrically following homogenisation and adjusted using dechlorinated tap water to 3 g/L (± 0.3 g/L). The sludge was maintained at 20 ± 2°C with aeration. During storage it was maintained at 20 ± 2°C and fed with synthetic sewage concentrate at a rate of 50 mL/L.
The sludge for the range-finder/limit test was collected on 26 April 2017.
Inoculum
The suspended solids concentration was determined before the range-finder/limit test. The concentration was 3 g/L after adjustment with dechlorinated tap water and was within the nominal range of 3 ± 0.3 g/L. The pH of the sludge was 7.16 within the acceptable range of 7.5 ± 0.5. - Test type:
- static
- Water media type:
- freshwater
- Limit test:
- yes
- Total exposure duration:
- 190 min
- Remarks on exposure duration:
- 180 minutes of aeration/incubation followed by 10 minutes in a sealed container with monitoring of change in dissolved oxygen.
- Post exposure observation period:
- Not Applicable.
- Hardness:
- Not specified
- Test temperature:
- 20 °C ± 2 °C
- pH:
- 7.03 to 7.26
- Dissolved oxygen:
- Respiration rates (mg O2/L/h) were determined by measuring the gradient of the linear portion of the graph. Measurements at high (> 7.0 mg/L) or low (< 2.0 mg/L) DO levels were avoided, where possible.
- Salinity:
- NA
- Conductivity:
- NA
- Nominal and measured concentrations:
- Nominal; 1, 10, 100 and 1000 mg/L
- Details on test conditions:
- Preparation of Test Vessels
Test vessels were ca 250 mL glass conical flasks (containing a total volume of 250 mL). Each vessel contained a synthetic sewage concentrate, dechlorinated tap water, test substance or reference substance and nitrification inhibitor, as appropriate. The reference substance and nitrification inhibitor were added to the test system in aqueous solution. At appropriate intervals, test samples were inoculated and aerated immediately. After addition of the test substance, inoculum and additional water, the nominal suspended solids concentration was 1.5 g/L. Each culture was aerated for ca 3 hours by bubbling air through the test system. The rate of aeration was sufficient to keep the test samples adequately mixed. Each vessel contained more than required test preparation for the number of samples assessed. Treatment of Test Substance Vessels The test substance was insufficiently soluble to permit addition via aqueous solution. Individually weighed quantities of test substance were added to the appropriate test vessels. The range-finder/limit test vessels, were prepared at concentrations of 1, 10, 100 and 1000 mg/L. Two aliquots of each vessel were used as individual replicates for respiration assessments and three at the highest (1000 mg/L level concentration). Immediately after preparation, the pH of each vessel was determined. Treatment of Reference Substance Vessels Single preparations were tested containing the reference substance (3,5-DCP) at nominal concentrations of 0.1, 2.0 and 40 mg/L.
Nitrification Inhibitor
The nitrification inhibitor, N-allylthiourea (ATU), was added to appropriate test and reference vessels to give a final concentration of ca 11.6 mg/L ATU in the test system. Blank Control Vessels Three blank controls were prepared to enable measurement in six vessels during the test series. Measurement of Respiration Rates At the end of the 3-hour incubation period, a portion (20 mL) of each test preparation (see Treatment of Test Substance Vessels) was transferred to an appropriate sample tube containing a PTFE stirrer. For those samples requiring amendment with ATU, this was undertaken at least 10 minutes prior to oxygen consumption measurement. The DO (dissolved oxygen) electrode was sealed in the neck of the flask, ensuring air was completely excluded. The flask contents were stirred at a constant rate during DO measurements. Oxygen consumption was measured over a period of up to 10 minutes. Respiration rates (mg O2/L/h) were determined by measuring the gradient of the linear portion of the graph. Measurements at high (> 7.0 mg/L) or low (< 2.0 mg/L) DO levels were avoided, where possible. The Strathtox instrumentation generated both graphical data as well as calculated results.
Incubation Conditions
The sludge was maintained at 20 ± 2°C with aeration for the incubation period. However the room temperature reached a maximum of 22.1°C, which had no adverse effect on the study outcome. Measurements of respiration rate were regulated at 20°C by the Strathtox instrument.
Measurement of Respiration Rates
At the end of the 3-hour incubation period, a portion (20 mL) of each test preparation was transferred to an appropriate sample tube containing a PTFE stirrer. For those samples requiring amendment with ATU, this was undertaken at least 10 minutes prior to oxygen consumption measurement. The DO (dissolved oxygen) electrode was sealed in the neck of the flask, ensuring air was completely excluded. The flask contents were stirred at a constant rate during DO measurements. Oxygen consumption was measured over a period of up to 10 minutes. Respiration rates (mg O2/L/h) were determined by measuring the gradient of the linear portion of the graph. Measurements at high (> 7.0 mg/L) or low (< 2.0 mg/L) DO levels were avoided, where possible. The Strathtox instrumentation generated both graphical data as well as calculated results. - Reference substance (positive control):
- yes
- Remarks:
- The validity of the test system was checked by inclusion of a series of preparations which contained 3,5-dichlorophenol (3,5-DCP), a standard respiration inhibitor reference. The concentrations used were 0.1, 2.0 and 40 mg/L.
- Duration:
- 190 min
- Dose descriptor:
- EC50
- Effect conc.:
- > 1 000 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- inhibition of total respiration
- Duration:
- 190 min
- Dose descriptor:
- EC50
- Effect conc.:
- > 1 000 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- inhibition of heterotrophic respiration
- Duration:
- 190 min
- Dose descriptor:
- EC50
- Effect conc.:
- > 1 000 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- inhibition of respiration due to nitrification
- Duration:
- 190 min
- Dose descriptor:
- other: NOAEC
- Effect conc.:
- 1 000 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- inhibition of total respiration
- Duration:
- 190 min
- Dose descriptor:
- other: NOAEC
- Effect conc.:
- 1 000 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- inhibition of heterotrophic respiration
- Duration:
- 190 min
- Dose descriptor:
- other: NOAEC
- Effect conc.:
- 1 000 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- inhibition of respiration due to nitrification
- Details on results:
- The results of the range-finder/limit test are presented in the full report.
Total, heterotrophic and nitrification respiration rates were similar across the controls and all treatment levels. No inhibition was calculated for any type of respiration at up to, and including, 1000 mg/L. As there was < 50% inhibition observed in the test, the EC50 for total, heterotrophic and nitrification respiration could not be determined and is classed as > 1000 mg/L, which is the highest concentration level used in this test. As there were slight enhancement effects noted (observed as negative inhibition), the endpoint for this is reported as No Observed Adverse Effect Concentration (NOEAC). The NOAEC was therefore determined to be:
Total Respiration: 1000 mg/L
Heterotrophic Respiration: 1000 mg/L
Nitrification Respiration: 1000 mg/L - Results with reference substance (positive control):
- Reference substance (3,5-DCP) inhibition was calculated to be within the validity criteria:
Total Respiration: 7.2 mg/L
Nitrification Respiration: 4.1 mg/L - Reported statistics and error estimates:
- The validity criteria (blank control respiration rate and the coefficient of variation between replicates) were also satisfied; the results of the limit test can therefore be considered to be valid.
- Validity criteria fulfilled:
- yes
- Conclusions:
- There were no statistically significant effects on respiration observed during the test. The EC50 for Isodecyl 3,5,5-trimethylhexanoate / Wickenol 152 was greater than 1000 mg/L under the test conditions. The NOAEC value was determined to be 1000 mg/L, the highest concentration tested.
- Executive summary:
The aim of this study was to determine the no observable effect concentration (NOEC) and estimate the effect concentration for an x% effect (ECx) for activated sludge exposed to the test substance, where possible. The study was undertaken according to OECD Guideline 209, Activated Sludge, Respiration and Inhibition Test (Carbon and Ammonium Oxidation), adopted July, 2010. The activated sludge inoculum was collected from the sludge return line at Burley Menston Sewage Treatment Works (West Yorkshire, U.K.), which has a predominantly domestic catchment. The point of collection was to ensure that the activated sludge sample was relatively free of exogenous material. A range-finder/limit test, employing nominal Isodecyl 3,5,5-trimethylhexanoate / Wickenol 152 concentrations of 1, 10, 100 and 1000 mg/L, was undertaken to determine the appropriate concentration levels for a definitive test. The range- finder/limit test showed no statistically significant inhibition of total, nitrification or heterotrophic respiration at the highest concentration (1000 mg/L). As there were sufficient control replicates at the start and end of each exposure period and the highest concentration (1000 mg/L) was conducted in triplicate, as per the OECD 209 guideline, it was not therefore necessary to carry out any further testing. Determination of EC50 was not possible and is therefore reported to be greater than 1000 mg/L (the highest concentration of Isodecyl 3,5,5-trimethylhexanoate / Wickenol 152 tested under these conditions). As there were slight enhancement effects noted (observed as negative inhibition), the endpoint for this is reported as No Observed Adverse Effect Concentration (NOEAC). The NOAEC for Isodecyl 3,5,5 -trimethylhexanoate / Wickenol 152 is therefore reported to be 1000 mg/L.
Concentration (mg/L) Concentration (mg/L) Concentration (mg/L) Total Respiration Heterotrophic Respiration Nitrification Respiration NOAEC 1,000 1,000 1,000 EC50 >1,000 >1,000 >1,000 The validity criteria applied to this study type were met and therefore the data are
considered valid.
- Endpoint:
- activated sludge respiration inhibition testing
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- other information
- Justification for type of information:
- See attached
- Reason / purpose for cross-reference:
- read-across source
Referenceopen allclose all
Concentration (mg/L) | Concentration (mg/L) |
Concentration (mg/L) | |
Total Respiration |
Heterotrophic Respiration | Nitrification Respiration | |
NOAEC | 1,000 | 1,000 | 1,000 |
EC50 | >1,000 | >1,000 | >1,000 |
Description of key information
Key value for chemical safety assessment
Additional information
The NOAEC was >1000 mg/L
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