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Diss Factsheets
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EC number: 941-661-3 | CAS number: -
- 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
![](https://echa.europa.eu/o/diss-blank-theme/images/factsheets/A-REACH/factsheet/print_ecotoxicological-information.png)
Short-term toxicity to aquatic invertebrates
Administrative data
- Endpoint:
- short-term toxicity to aquatic invertebrates
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 13 August 2019 to 15 August 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 guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)
- Version / remarks:
- 13 April 2004
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
Test material
- Reference substance name:
- 3-tert-butyl-1-(3,5-dicarboxyphenyl)-1H-pyrazol-5-aminium chloride
- EC Number:
- 941-661-3
- Molecular formula:
- C15H18ClN3O4
- IUPAC Name:
- 3-tert-butyl-1-(3,5-dicarboxyphenyl)-1H-pyrazol-5-aminium chloride
- Reference substance name:
- Unidentified impurity
- IUPAC Name:
- Unidentified impurity
Constituent 1
impurity 1
Sampling and analysis
- Analytical monitoring:
- yes
- Details on sampling:
- Analytical measurements were performed from the control and at the applied test concentration levels at the beginning and at the end of the experiment.
Test solutions
- Details on test solutions:
- Reconstituted water (ISO medium, according to OECD 202) was used as dilution water for both the range finding and definitive tests. The same composition of reconstituted water was used for the tests and for breeding the test animals. A stock solution with a concentration of 100.0 mg/L (nominal) was prepared with direct addition of the test item, mixed into the test medium (ISO Medium) using ultrasonic bath (approximately 25 minutes). The test solutions were prepared by appropriate dilution of this stock solution just before introduction of the Daphnia (start of the experiment).
Test organisms
- Test organisms (species):
- Daphnia magna
- Details on test organisms:
- Species and strain: Daphnia magna
Source: István Szent University, 2100 Gödöllő, Páter Károly u. 1, Hungary
Breeding: The Daphnia are bred in Ecotoxicological Laboratory of Citoxlab Hungary Ltd.
The health of the stock animals is continuously monitored by visual daily checking. Abnormal behaviour or significant decrease of population is recorded.
Justification of strain: Daphnia magna is the standard species of the acute immobilisation test.
Number of animals: There were 20 animals in test group and control group respectively, divided into 4 replicates (5 animals / replicate)
Age of the animals: They were less than 24 h old at the beginning of the test
Acclimatization: There was no acclimatization because the water used was similar to the culture water.
Study design
- Test type:
- static
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 48 h
Test conditions
- Test temperature:
- 20.0 - 20.5 ºC
- pH:
- 5.30 - 7.78
- Dissolved oxygen:
- 8.0 - 8.6 mg/l
- Nominal and measured concentrations:
- The following nominal concentrations were tested: 6.25, 12.5., 25.0, 50.0 and 100.0 mg/L.
Test concentrations were analytically determined at the start and at the end of the experiment. The corresponding measured geometric mean test item concentrations were: 6.19, 12.49, 24.49, 49.33 and 99.67 mg/L.
As the analytically measured concentrations deviated not more than 20 per cent from the nominal, the biological results are related to the nominal test item concentrations. - Details on test conditions:
- The test duration was 48 hours. Twenty animals, divided into four groups (glass beakers) of five animals each (at least 5 mL test solution/animal) were used at the test concentrations and for the control group as well under static conditions.
The choice of the test concentration was made on the basis of the results of the preliminary range-finding test. - Reference substance (positive control):
- no
Results and discussion
Effect concentrationsopen allclose all
- Duration:
- 24 h
- Dose descriptor:
- EC50
- Effect conc.:
- > 100 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- behaviour
- Duration:
- 48 h
- Dose descriptor:
- EC50
- Effect conc.:
- 82.52 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- behaviour
- Duration:
- 48 h
- Dose descriptor:
- EC100
- Effect conc.:
- > 100 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- behaviour
- Duration:
- 48 h
- Dose descriptor:
- NOEC
- Effect conc.:
- 50 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- behaviour
- Duration:
- 48 h
- Dose descriptor:
- LOEC
- Effect conc.:
- 100 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- behaviour
- Details on results:
- In addition to immobility, no abnormal behaviour or appearance of test animals was detected.
There was no immobilization in the control group and the dissolved oxygen concentration at the end of the test in control and test vessels was more than 3 mg/L.
All validity criteria were within acceptable limits and therefore the study is considered as valid.
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Conclusions:
- The 48h EC50 value was determined to be 82.52 mg/l (nominal) (95% conf. limits 70.40 - 95.37 mg/l) in this study.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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