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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study performed to GLP and guideline

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2003

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 201 (Alga, Growth Inhibition Test)
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): Calcium sulfate dihydrate
- Analytical purity: 99.9%
- Lot/batch No.: Sigma Aldrich Corporation -Lot No. 109H0166

Test organisms

Test organisms (species):
Pseudokirchneriella subcapitata (previous names: Raphidocelis subcapitata, Selenastrum capricornutum)

Study design

Limit test:
yes

Test conditions

Test temperature:
22 - 23 °C
pH:
7.97 - 8.03 at start and 8.03 - 8.20 at finish
Nominal and measured concentrations:
Limit test performed at a nominal concentration of 100 mg/L

Results and discussion

Effect concentrations
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 79 mg/L
Remarks on result:
other: The EC50 of calcium sulfate dihydrate was > 100 mg/L. The result has been corrected for calcium sulfate anhydrous
Details on results:
There was no significant difference in the growth curves between the test group and the control group.

Applicant's summary and conclusion

Conclusions:
The 72 h EC50 of calcium sulfate anhydrous to algae is >79 mg/L.