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Ecotoxicological information

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:
2017-03-10 to 2017-04-20
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2017
Report Date:
2017

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method C.2 (Acute Toxicity for Daphnia)
Deviations:
no
Qualifier:
according to
Guideline:
other: Guidance document on aquatic toxicity testing of difficult items and mixtures, OECD series on testing and assessment number 23, December 14, 2000
Deviations:
no
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Details on test material:
- Name of test material (as cited in study report): JNJ-7982559-AAA (T001329)
- Physical state: solid (powder)
- Appearance: Grey-brown powder
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: I14IB3639
- Expiration date of the lot/batch: 2020-09-17 (retest date)
- Purity test date: 2016-10-20 (certificate of analysis release date)
- Purity: 97.9% (based on HPLC)

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: at room temperature
- Stability under test conditions: not indicated
- Solubility and stability of the test substance in the solvent/vehicle: <0.001 g/L in water, stability in water not indicated

Sampling and analysis

Analytical monitoring:
yes
Details on sampling:
- Sampling method: Single samples (2.0 mL) for possible analysis were taken form all test concentrations and the control at t=0 and t=48h. At the end of the exposure period, the replicates were pooled at each concentration before sampling.
- Sample storage conditions before analysis: The samples were stored in a freezer (<= -15°C). Additionally, reserve samples of 2.0 mL were taken for possible analysis.

Test solutions

Vehicle:
no
Details on test solutions:
PREPARATION AND APPLICATION OF TEST SOLUTION (especially for difficult test substances)
- Method: Due to an expected low water solubility of the test item, a saturated solution (SS) was prepared. Preparation of test solutions started with a loading rate of 100 mg/L applying 20 minutes of ultrasonicated followed by 3 days of magnetic stirring at room temperature to reach the maximum solubility of the test item in the test medium. The resulting aqueous mixture was filtered through a preconditioned 0.45 µm membrane filter (Whatman; RC55). The resulting SS was used as the highest test concentration. The lower test concentrations were prepared by subsequent dilutions of the SS in test medium.
- Evidence of undissolved material (e.g. precipitate, surface film, etc): All final test solutions were clear and colourless

Test organisms

Test organisms (species):
Daphnia magna
Details on test organisms:
TEST ORGANISM
- Common name: Water-flea
- Source: in-house laboratory culture with a known history
- Age at study initiation (mean and range, SD): < 24 h (from parental daphnids older than 2 weeks old, maximum age 4 weeks)
- Method of breeding: 250 newborn daphnids (i.e. less than 3 days old) are placed into 5 liters of medium in an all-glass culture vessel. Medium is M7. After 7 days of cultivation half of the medium is renewed twice a week.
- Feeding during cultivation: a suspension of fresh water algae, daily
- Feeding during test: no

ACCLIMATION
- Acclimation period: not relevant

Study design

Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
48 h

Test conditions

Hardness:
180 mg/L as CaCO3
Test temperature:
18-22°C
pH:
At t=0h: 7.8 - 7.9
At t=48h: 8.0 - 8.1
Dissolved oxygen:
At t=0h: 9.3 - 10
At t=48h: 9.1 - 9.2
Salinity:
not relevant
Nominal and measured concentrations:
Range finder:
Nominal concentrations: 100% of SS
Measured concentrations (mg/L) at t=0h: 0.737
Measured concentrations (mg/L) at t=48h: 0.713

Final test:
Nominal concentrations: 0 and 100% of SS
Measured concentrations (mg/L) at t=0h: n.d., 0.612
Measured concentrations (mg/L) at t=48h: n.d., 0.607

Twenty daphnids per group (5 per replicate, quadruplicate) were exposed to an untreated control and to solutions containing 4.6, 10, 22, 46 and 100% of a SS prepared at 100 mg JNJ-7982559-AAA (T001329) per litre. Samples taken from the undiluted SS were analysed.
Details on test conditions:
TEST SYSTEM
- Test vessel: 100 mL all-glass
- Material, size, headspace, fill volume: 100 mL, glass beaker filled with 80 mL
- Aeration: not during the test
- No. of organisms per vessel: 5
- No. of vessels per concentration (replicates): 4
- No. of vessels per control (replicates): 4
- Test medium: adjusted ISO medium

OTHER TEST CONDITIONS
- Photoperiod: 16h light daily

EFFECT PARAMETERS MEASURED (with observation intervals if applicable): Immobility was defined as those organisms which are not able to swim within 15 seconds after gentle agitation of the test container and was monitored after 24 and 48 hours of continuous treatment with the test substance.

TEST CONCENTRATIONS
- Spacing factor for test concentrations: 2.2
- Range finding study
- Test concentrations: 0, 1.0, 10 and 100% of a SS prepared at a loading rate of 100 mg/L (setup: combined range finding/limit test)
- Results used to determine the conditions for the definitive study: yes
Reference substance (positive control):
yes
Remarks:
Potassium dichromate

Results and discussion

Effect concentrationsopen allclose all
Key result
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
> 100 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mobility
Key result
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
> 100 other: % of a Saturated Solution prepared at 100 mg test substance/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mortality
Details on results:
- Mortality of control: none
- Other adverse effects control: no
- Abnormal responses: none
Results with reference substance (positive control):
- Results with reference substance valid? yes
- Mortality: no
- EC50/LC50: 48-h EC50 = 0.48 mg/L (95% C.L: 0.43-0.53 mg/L). The sensitivity of the daphnids was within the range determined with the historical data collected at Charles River Den Bosch.

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
The acute toxicity of T001329 to Daphnia magna was determined in a 48 hour static test according to OECD guideline 202. Based on the results obtained during the present Daphnia study, the 48h-EC50 was beyond the range tested, i.e. exceeded a measured exposure concentration of 0.61 mg/L, being considered the maximum solubility of test item in a filtrate prepared at a loading rate of 100 mg/L. In conclusion, the test item had no significant inhibitory effect on Daphnia magna after an exposure of 48 hours up to and including the highest concentration/loading rate of a filtrate prepared at a loading rate of 100 mg/L.The results of the test can be considered reliable without restriction.