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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:
05.03.2008 to 02.06.2008
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2008
Report Date:
2008

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)
Qualifier:
according to
Guideline:
EU Method C.2 (Acute Toxicity for Daphnia)
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Remarks:
migrated information: powder

Sampling and analysis

Analytical monitoring:
yes

Test solutions

Details on test solutions:
In the final test twenty daphnia per test group (5 per vessel, 4 vessels) were exposed to a control and nominal DCM concentrations of 1.0, 2.2, 4.6, 10, 22 and 46 mg/l. The total test period was 48 hours and a static test system was applied. Samples for analytical confirmation of actual exposure concentrations were taken at the start and the end of the test period.

Test organisms

Test organisms (species):
Daphnia magna
Details on test organisms:
Species: Daphnia magna (Crustacea, Cladocera) (Straus, 1820), at least third generation, obtained by acyclical parthenogenesis under specified breeding conditions.
Source: In-house laboratory culture with a known history.
Reason for selection: This system has been selected as an internationally accepted invertebrate species.
Validity of batch: Daphnids originated from a healthy stock, 2nd to 51 h brood, showing no signs of stress such as mortality >20%, presence of males, ephippia or discoloured animals and there was no delay in the production of the first brood.
Characteristics: For the test selection of young daphnids with an age of< 24 hours, from parental daphnids of more than two weeks old.

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.
Maximum age of the cultures: 4 weeks
Renewal of the cultures: After 7 days of cultivation half of the medium twice a week.
Temperature of medium: 18 - 22 °C
Feeding: Daily, a suspension of fresh water algae.
Medium: M7, as prescribed by Dr. Elendt-Schneider (Elendt, B.-P., 1990: Selenium deficiency in Crustacea. An ultrastructural approach to antennal
damage in Daphnia magna Straus. Protoplasma 154, 25-33).

Study design

Test type:
static
Water media type:
freshwater
Limit test:
yes
Total exposure duration:
48 h

Test conditions

Hardness:
180 mg/l expressed as CaC03
Test temperature:
19 - 20.7 °C
pH:
7.7 - 8.0
Dissolved oxygen:
8.9 mg/l
Details on test conditions:
Test duration: 48 h
Test type: static
Test vessels: 100 ml, all-glass
Medium: Adjusted ISO medium
Number of daphnids: 20 per concentration
Loading: 5 per vessel containing 80 ml of test solution
Light: 16 hours photoperiod daily at low intensity (19 lux)
Feeding: No feeding
Aeration: No aeration of the test solutions.
Introduction of daphnids: Within 1/2 hour after preparation of the test solutions.

Results and discussion

Effect concentrations
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
10 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mobility
Remarks on result:
other: 95%CL: 8.9-12 mg/l

Any other information on results incl. tables

Analyses of the samples showed that measured concentrations were stable and in agreement with nominal (85 -103%).

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
Under the conditions of the present study DCM did not induce acute immobilisation of Daphnia magna at 4.6 mg/1 after 48 hours of exposure
(NOEC). The 48h-EC50 was 10 mg/l based on analytically confirmed nominal concentrations (95% confidence interval between 8.9 and 12 mg/l).