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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:
August 22, 2018 - October 08, 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)
Version / remarks:
2004
Deviations:
no
Qualifier:
according to
Guideline:
EU Method C.2 (Acute Toxicity for Daphnia)
Version / remarks:
Council Regulation (EC) No. 440/2008 laying down test methods pursuant to Regulation (EC) No. 1907/2006 of the European Parliament and the council on the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH).
Deviations:
no
GLP compliance:
yes (incl. certificate)
Specific details on test material used for the study:
Preparation of the Test Item:
A stock preparation with a test item concentration of 100 mg/L was freshly prepared. For that purpose, the test item was weighed in a calibrated flask and vehicle was added. The preparation was stirred with a magnetic stirrer for 24 hours. Then the formulation was passed through a filter membrane (pore size: 0.2 µm). The filtrate was used for the study. The pH was not adjusted.
Analytical monitoring:
no
Remarks:
The test item concentration in the reconstituted water was not quantified at the start and the end of this study. Because of the low water solubility (0.00306 mg/L), the compound cannot be detected with standard analytical methods.
Details on sampling:
- Concentrations: 0, 100 mg/L (nominal)
- Sampling method: undiluted
- Sample storage conditions before analysis: no, analysis performed directly after preparation
Vehicle:
yes
Details on test solutions:
Macro nutrients (mg/L)
CaCI2 •2H20 293.80
MgSO4•7H20 123.30
NaHCO3 64.80
KCI 5.80
Na2SiO3•9H20 10.00
NaNO3 0.27
KH2PO4 0.14
K2HPO4 0.18

Trace elements (mg/L)
B 0.5000
Fe 0.2000
Mn 0.1000
Li, Rb and Sr 0.0500
Mo 0.0250
Br 0.0125
Cu and Zn 0.0063
Co and I 0.0025
Se 0.0010
V 0.0003

Macro nutrients (mg/L)
Na2EDTA • 2H20 2.50

Vitamins (µg/L):
Thiamine 75.00
B12 1.00
Biotin 0.75

- pH: 7.90
- O2: 8.78 mg/L
- Conductivity: 674 µS/cm
- Total hardness: 237 mg CaCO3/L

Preparation of the Test Item:
A stock preparation with a test item concentration of 100 mg/L was freshly prepared. For that purpose, the test item was weighed in a calibrated flask and vehicle was added. The preparation was stirred with a magnetic stirrer for 24 hours. Then the formulation was passed through a filter membrane (pore size: 0.2 µm). The filtrate was used for the study. The pH was not adjusted.
Test organisms (species):
Daphnia magna
Details on test organisms:
Species: Daphnia magna Straus
Culture conditions: The clone is bred in the laboratories .
Parental daphnids are used for reproduction until they are about 6 weeks old. Thereafter, they are replaced by neonates.
Daphnids are kept individually in 100 mL glass vessels containing approximately 60 mL reconstituted water (ELENDT M4 medium) at a water temperature of 20 ± 2°C and a 16 hour light and 8 hour dark regime to ensure similar conditions as in the experiment. Offspring are removed from the vessels at least twice per week.
Feeding: The parental daphnids are fed ad libitum with unicellular green algae Desmodesmus subspicatus three times per week.
Age: Offspring less than 24 hours old were used for the study.
Acclimation period: same as test

Feeding during test: None

Test type:
static
Water media type:
freshwater
Limit test:
yes
Total exposure duration:
48 h
Hardness:
246 mg CaCO3/L
Test temperature:
20.5 to 21.0°C
pH:
7.76 - 7.78 (control group)
8.04 - 7.91 (test group)
Dissolved oxygen:
8.61 - 8.45 (control group)
8.11 - 8.19 (test group)
Conductivity:
721 µS/cm
Nominal and measured concentrations:
Nominal 100 mg/L
Details on test conditions:
TEST SYSTEM
- Test vessel: Glass test tubes
- Type (delete if not applicable): open
- Material, size, headspace, fill volume: 20 mL glass test tubes containing 20 mL medium
- Aeration: no
- No. of organisms per vessel: 5
- No. of vessels per concentration (replicates): 4
- No. of vessels per control (replicates): 4

TEST MEDIUM / WATER PARAMETERS
- Source/preparation of dilution water: reconstituted water (ELENDT M4 medium according OECD 202)
- Total organic carbon: no data
- Particulate matter: no data
- Metals: no data
- Pesticides: no data
- Chlorine: no data
- Alkalinity: no data
- Ca/mg ratio: no data
- Conductivity: 721 µS/cm
- Salinity: no data
- Culture medium different from test medium: no
- Intervals of water quality measurement: at start and end of exposure

OTHER TEST CONDITIONS
- Adjustment of pH: no
- Photoperiod: 16h light / 8h dark
- Light intensity: The mean light intensities were 662 Lux and 675 Lux prior to and at the end of the exposure period, respectively.

EFFECT PARAMETERS MEASURED (with observation intervals if applicable) : Immobilisation (daily)

VEHICLE CONTROL PERFORMED: no

RANGE-FINDING STUDY
- Test concentrations: 100 mg/L
- Results used to determine the conditions for the definitive study: no immobilisation observed at 100 mg/L
Reference substance (positive control):
no
Remarks:
No positive control used in this study. The accuracy and reliability of the test method is demonstrated periodically as recommended by guidelines with potassium dichromate.
Duration:
24 h
Dose descriptor:
EC50
Effect conc.:
> 100 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mobility
Remarks on result:
other: EC50 >0.0006 mg/L (LOD)
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
Remarks on result:
other: EC50 >0.0006 mg/L (LOD)
Details on results:
An aqueous solution of nominal 100 mg/L of the test item revealed no aquatic toxicity in the test system.

The 48h EC50 exceeded the water solubility of 0.0006 mg/L (nominal >100 mg/L) and, thus, could not be determined in this study.

- Behavioural abnormalities: no
- Other biological observations: no
- Mortality of control: no
- Other adverse effects control: no
- Abnormal responses: no
- Any observations (e.g. precipitation) that might cause a difference between measured and nominal values: no
Results with reference substance (positive control):




Objective:
The objective of this study was to determine the effect of the positive control substance
Art. 104864 (Potassium dichromate) on the immobilization of Daphnia magna in order to check the sensitivity of the test system as recommended by guidelines (Council Regulation (EC) No. 440/2008 and OECD Guideline No. 202).

Study design:
Juvenile daphnids were exposed to different concentrations of the test item (0, 0.31, 0.46, 0.69, 1.02 and 1.52 mg/L) in an open static system. 20 daphnids, divided into four replicates, each with five animals were used per concentration and control. The daphnids were observed for immobilization after 24 and 48 hours of exposure.

Results:
No effect on the mobility of the daphnia was observed at the two lowest concentrations of
0.31 mg/L and 0.46 mg/L. A concentration dependent immobilization was observed at concentrations of 0.69 to 1.52 mg/L.


EC50 values with 95% confidence intervals:
24h EC50 1.13 mg/L (0.98 – 1.34 mg/L)
48h EC50 0.74 mg/L (0.66 – 0.82 mg/L)

Conclusion:
Under the conditions of the present study, the test item Potassium dichromate showed a 24h EC50 value of 1.13 mg/L which is within the range of the published data of 0.6 to 1.7 mg/L (Council Regulation (EC) No. 440/2008) and 0.6 to 2.1 mg/L (OECD Guideline No. 202).

Therefore, this study confirms the sensitivity and reliability of the test system used in the test facility.


Objective

The objective of this study was to determine the effect of the test item on the immobilization of Daphnia magna.

Study Design

Juvenile daphnids were exposed to a nominal test item concentration of 100 mg/L (limit test) in an open static system. 20 daphnids, divided into four replicates, each with five animals were used in the test item group and the control group. The daphnids were observed for immobilization after 24 and 48 hours of exposure.

Results

The test item concentration in the reconstituted water was not quantified at the start and the end of this study. Because of the low water solubility (0.0006 mg/L), the compound cannot be detected with standard analytical methods and the development of an analytical method with a sufficiently low detection and quantification limit is complex.

Due to the absence of any adverse effects at the saturation concentration, the study was performed without analytical concentration verification.

No effect on the mobility of the daphnia was observed at a nominal concentration of 100 mg/L.

For the test item the following EC50 values were determined:

EC50 (24h) > 0.0006 mg/L (nominal >100 mg/L)

EC50 (48h) > 0.0006 mg/L (nominal >100 mg/L)

Conclusion

Under the conditions of the present study, an aqueous solution of nominal 100 mg/L of the test item revealed no toxicity to daphnids.The 48h EC50 was >0.0006 mg/L (nominal >100 mg/L) and, thus, could not be determined in this study.

Validity criteria fulfilled:
yes
Conclusions:
Under the conditions of the present study, an aqueous solution of nominal 100 mg/L of the test item revealed no toxicity to daphnids.
The 48h EC50 was >0.0006 mg/L (nominal >100 mg/L) and, thus, could not be determined in this study.



Executive summary:

This study was performed according to GLP and the methods applied are fully compliant with OECD TG 202. Under the conditions of the present study, an aqueous solution of nominal 100 mg/L of the test item revealed no toxicity to daphnids.The 48h EC50 was >0.0006 mg/L (nominal >100 mg/L) and, thus, could not be determined in this study.

Description of key information

OECD 202: EC50 (48 h) > 100 mg/L (nominal); EC50 > 0.006 mg/L (LOD)

No effect on the mobility of the daphnia was observed at a nominal concentration of 100 mg/L, i.e. up to the maximum water solubility.

Key value for chemical safety assessment

Additional information