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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:
28-30 April 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study was performed in accordance with the OECD 202 guideline and complied with the principles of GLP.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2014
Report Date:
2015

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
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Remarks:
migrated information: powder
Details on test material:
- Name of test material (as cited in study report): Strontium tartrate (anhydrous)
- Appearance: Off-white powder

Sampling and analysis

Analytical monitoring:
yes
Details on sampling:
4.8 mL samples for possible analysis were taken from all test concentrations and the control at t=0 and t=48 hours and were stored in the freezer until analysis.

Test solutions

Vehicle:
no
Details on test solutions:
Preparation of test solutions started with the highest concentration (100 mg/L) applying 30 minutes of magnetic stirring to accelerate the dissolving of the test substance in the test medium. The lower test concentrations were prepared by subsequent dilutions of the stock in test medium. The final test solutions were all clear and colourless.

Test organisms

Test organisms (species):
Daphnia magna
Details on test organisms:
TEST ORGANISM
- Common name: Dapnia magna
- Source: In-house laboratory culture with a known history, at least third generation, obtained by acyclical parthenogenesis under specified breeding conditions.
- Age at study initiation (mean and range, SD): young daphnids with an age of < 24 hours, from parental daphnids of more than two weeks old.
- Method of breeding: start of each batch with newborn daphnids, i.e. less than 3 days old, by placing about 250 of them into 5 litres of medium in an all-glass culture vessel. Renewal of the cultures: after 7 days of cultivation half of the medium twice a week.
- Feeding during test: no

ACCLIMATION
- Acclimation period: <24 hours
- Acclimation conditions (same as test or not): no, breeding medium is M7
- Type and amount of food: a suspension of fresh water algae
- Feeding frequency: daily


Study design

Test type:
static
Water media type:
freshwater
Total exposure duration:
48 h
Post exposure observation period:
None

Test conditions

Hardness:
180 mg/L expressed as CaCO3
Test temperature:
18.7 - 19.4 ºC
pH:
7.7-8.0
Dissolved oxygen:
8.6-9.1 mg/L
Salinity:
Not applicable.
Nominal and measured concentrations:
Nominal: 0.10, 1.0, 10 and 100 mg/L
At 100 mg/L, the actual concentration was at the level of nominal (109%) at the start of the test and remained stable during the test (99% of initial). Consequently, the effects parameters were reported in terms of the analytically confirmed nominal concentration.
Details on test conditions:
TEST SYSTEM
- Test vessel:100 mL, all-glass, fill volume 80 mL
- Aeration: None
- No. of organisms per vessel: 5
- No. of vessels per concentration (replicates): 4 for the limit concentration, 2 for the remaining concentrations
- No. of vessels per control (replicates): 4
- Biomass loading rate: 5 per vessel containing 80 mL test solutionn

TEST MEDIUM / WATER PARAMETERS
- Source/preparation of dilution water: Adjusted ISO medium
- Culture medium different from test medium: Culture medium had extra trace elements, macro nutrients and vitamins added as specified in Medium M7.

OTHER TEST CONDITIONS
- Adjustment of pH: no
- Photoperiod: 16 hours per day, During the first 24 hours of the study the lights were not turned off during the night. Therefore, the light period was longer than 16 hours during the first 24 hours.
- Light intensity: not indicated

EFFECT PARAMETERS MEASURED: mobility at 24 and 48 hours ; pH and dissolved oxygen at the beginning and at the end of the test. Temperature continuously.

TEST CONCENTRATIONS
- Test concentrations: combined limit/range-finding test: 0.10, 1.0, 10 and 100 mg/L.
Reference substance (positive control):
yes
Remarks:
Potassiumdichromate

Results and discussion

Effect concentrations
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: Nominal test concentrations were analytically confirmed.
Details on results:
No effects were observed in any of the groups tested.
Results with reference substance (positive control):
The 48h-EC50 was 0.32 mg/L with a 95% confidence interval between 0.29 and 0.37 mg/L.

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Remarks:
1. No effects were observed in the control. 2. The oxygen concentration at the end of the test was ≥3 mg/l in control and test vessels
Conclusions:
No effects were observed in any of the groups. The 48h-EC50 of the test substance to Daphnia magna is > 100 mg/L.
Executive summary:

A 48-h acute toxicity study in Daphnia magna was performed with Sodium tartrate according to OECD 202 and in compliance with GLP principles. A combined range-finder/ limit test was carried out under static conditions. The nominal test concentrations wer 0.10, 1.0, 10 and 100 mg/L. Preparation of test solutions started with the highest concentration (100 mg/L) applying 30 minutes of magnetic stirring to accelerate the dissolving of the test substance in the test medium. The lower test concentrations were prepared by subsequent dilutions of the stock in test medium. The final test solutions were all clear and colourless. Samples were taken for analysis at t = 0 and 48 hours. Samples of the control and 100 mg/L group were analysed by an ICP-MS method. At 100 mg/L, the actual concentration was at the level of nominal (109%) at the start of the test and remained stable during the test (99% of initial). Consequently, the effects parameters were reported in terms of the analytically confirmed nominal concentration.

During the first 24 hours of the study the lights were not turned off during the night. Therefore, the light period was longer than 16 hours. The results show that the daphnids were not affected (no immobility observed). Furthermore, at the end of the test the test substance concentration remained at the initial concentration (99% of initial) indicating that the light period did not influence the test substance concentration.

No effects were observed in any of the groups. The 48h-EC50 of the test substance to Daphnia magna is > 100 mg/L