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Short-term toxicity to aquatic invertebrates

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Reference
Endpoint:
short-term toxicity to aquatic invertebrates
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017-01-27 to 2017-02-07
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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
Principles of method if other than guideline:
Guidance document on aquatic toxicity testing of difficult items and mixtures, OECD series on testing and assessment number 23, December 14, 2000.
GLP compliance:
yes (incl. certificate)
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Analytical purity:
- Source and lot/batch No.of test material: I16CB1581
- Expiration date of the lot/batch: 2019-04-04 (retest date)
- Purity test date: 2016-04-07 (certificate of analysis release date)

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: At room temperature
- Stability under test conditions: stable
- Solubility and stability of the test substance in the solvent/vehicle: solubility in water: <0.01 g/L
Analytical monitoring:
yes
Details on sampling:
- Sampling method: samples for possible analysis were taken form all test concentrations and the control at t=0 and t=48h. 2.0 mL of volume was taken from the approximate centre of the test vessels. 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. Additionally, reserve samples of 2.0 mL were taken for possible analysis
Vehicle:
no
Details on test solutions:
PREPARATION AND APPLICATION OF TEST SOLUTION (especially for difficult test substances)
- Method: the test item, a saturated solution (SS) was prepared. The preparation of the SS started with a loading rate of 100 mg/L applying a three-day period of magnetic stirring at room temperature to ensure maximum dissolution of the test item in test medium. This resulted in a hazy dispersion containing undissolved material. The obtained dispersion was filtered through a 0.45 µm membrane filter (Whatman; RC55). The filter was pre-conditioned with a small volume of test solution that was discarded. The resulting SS was used as the highest test concentration. Lower test concentrations were prepared by subsequent dilutions of the SS in test medium.
- Evidence of undissolved material (e.g. precipitate, surface film, etc): final test solutions were clear and colourless
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): <24h (from parental daphnids of more than 2 weeks old)
- Method of breeding: 250 newborn daphnids (i.e. less than 3 days old) are placed into 5 litres 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 test: no

ACCLIMATION
- Acclimation period: max. 4 weeks
- Acclimation conditions (same as test or not): yes
- Type and amount of food: fresh water algae.
- Feeding frequency: daily
- Health during acclimation (any mortality observed): no
Test type:
static
Water media type:
freshwater
Limit test:
yes
Total exposure duration:
48 h
Hardness:
180 mg/L as CaCO3
Test temperature:
19-20°C
pH:
At t= 0h: 8.0
At t= 48h: 8.0
Dissolved oxygen:
At t= 0h: 8.4-9.0
At t= 48h: 8.9-9.0
Salinity:
not relevant
Nominal and measured concentrations:
Final test
Nominal concentrations: 1.0, 10 and 100% of a SS prepared at 100 mg/L.
Nominal concentration analysed: 0 and 100 % of saturated solution
Measured concentrations (mg/L) at t=0h: 0.000068, 0.0494
Measured concentrations (mg/L) at t=48h: 0.00011, 0.0237
Details on test conditions:
TEST SYSTEM
- Test vessel: beaker
- Material, size, headspace, fill volume: 100 mL, glass beaker
- Aeration: not during the test
- Type of flow-through (e.g. peristaltic or proportional diluter): no flow-through
- Renewal rate of test solution (frequency/flow rate):no renewal, static system
- No. of organisms per vessel: 5
- No. of vessels per concentration (replicates): 4
- No. of vessels per control (replicates): 4

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: x1.8
- Range finding study
- Test concentrations: 1.0, 10.0 and 100% of a SS prepared at a loading rate of 100 mg/L
- Results used to determine the conditions for the definitive study: yes
Reference substance (positive control):
yes
Remarks:
potassium dichromate
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
> 0.034 mg/L
Nominal / measured:
meas. (geom. mean)
Conc. based on:
test mat.
Basis for effect:
mobility
Remarks on result:
other: C.L. 95%: not determined
Key result
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
> 100 mg/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
Any observations (e.g. precipitation) that might cause a difference between measured and nominal values:
Results with reference substance (positive control):
- Results with reference substance valid? yes
- EC50/LC50: 48h-EC50 = 0.48 mg/L. the sensitivity of the daphnia was within the range determined with the historical data collected at WIL Research Europe.
Reported statistics and error estimates:
The 24 and 48h-EC50 could not be calculated because the observed effects were below 50%.
Validity criteria fulfilled:
yes
Conclusions:
The acute toxicity of T003066 to Daphnia magna was determined in a 48-hour static test according to the OECD guideline 202.
The 48h-EC50 was beyond the range tested, i.e. exceeded an average exposure concentration of 0.034 mg/L, being considered the maximum solubility of test item in test medium. The test item had no significant inhibitory effect on the mobility of Daphnia magna. The results of the test can be considered reliable without restriction.

Description of key information

The acute toxicity of T003066 to Daphnia magna was determined in a 48-hour static test according to the OECD guideline 202 (Bouwman, 2017). The 48h-EC50 was beyond the range tested, i.e. exceeded an average exposure concentration of 0.034 mg/L, being considered the maximum solubility of test item in test medium. The test item had no significant inhibitory effect on the mobility of Daphnia magna.

Key value for chemical safety assessment

Additional information