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Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

Administrative data

Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
other information
Study period:
1988-04-14 to 1988-04-18
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1988
Report date:
1988

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
EPA OTS 797.1050 (Algal Toxicity, Tiers I and II)
GLP compliance:
yes (incl. QA statement)

Test material

Test material form:
liquid
Details on test material:
Clear colourless liquid
Specific details on test material used for the study:
Purity: 99.5%
Clear, colourless liquid

Sampling and analysis

Analytical monitoring:
yes

Test solutions

Vehicle:
yes
Remarks:
Acetone

Test organisms

Test organisms (species):
Raphidocelis subcapitata (previous names: Pseudokirchneriella subcapitata, Selenastrum capricornutum)
Details on test organisms:
- Source: Carolina Biological Supply Company Burlington, North Carolina USA
- Age of inoculum (at test initiation): three days

Study design

Test type:
static
Water media type:
freshwater
Total exposure duration:
96 h

Test conditions

Test temperature:
23-25°C
pH:
initial: 7.2 to 7.6
96h: 8.9 to 9.2
Conductivity:
initial: 180 to 190 µS/cm
96h: 190 to 200 µS/cm
Nominal and measured concentrations:
Nominal concentrations: 3.1, 6.3, 13, 25, and 50 mg/L
Measured concentrations: 0.40, 0.62, 1.8, 3.7, and 8.6 mg/L (based on mean of 0- and 96-hour analyses)

Results and discussion

Effect concentrations
Duration:
96 h
Dose descriptor:
EC0
Effect conc.:
> 8.6 mg/L
Nominal / measured:
meas. (arithm. mean)
Conc. based on:
test mat.

Applicant's summary and conclusion

Conclusions:
Under the conditions of this test algae groth was not inhibited in any test concentration, resutling in an EC0 (96h) for 3,4-Dichlorobenzotrifluoride of > 8.6 mg/L.