Reaction mass of calcium carbonate and calcium sulfate and magnesium hydroxide

Toxicity to aquatic algae and cyanobacteria

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

Test material information

Constituent 1

Reference substance name:

10101-41-4

EC Number:

600-148-1

Cas Number:

10101-41-4

IUPAC Name:

10101-41-4

Constituent 2

Reference substance name:

calcium sulfate dihydrate

IUPAC Name:

calcium sulfate dihydrate

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):

Raphidocelis subcapitata (previous names: Pseudokirchneriella 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.