Ferrosilicon - reaction mass of iron and iron disilicide and iron silicide and silicon

Toxicity to aquatic algae and cyanobacteria

Administrative data

Endpoint:

toxicity to aquatic algae and cyanobacteria

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 201 (Alga, Growth Inhibition Test)

Deviations:

not specified

Principles of method if other than guideline:

No results have been located on effects of ferrosilicon on aquatic plants.
FeSi grades are poorly water soluble alloys, even if the true water solubility values have not been determined by testing. The rate and extent to which FeSi alloys can produce soluble (bio)available ionic and other metal-bearing species in the various test media is basically known and need to be taken into account in considering aquatic testing. There are relatively good information available of metal ions released from the FeSi grades in different test media at pH 1.5-7.4 in 7 days. These results indicate hardly any effects at the level of 100 mg/l load, but this has not been demonstrated. At higher load levels the soluble fraction might be remarkable higher, depending on method of preparing the test solution (particle size, pH and contact time).

Conclusion: To fulfill the standard information requirement, a standard algae testing (OECD 201/C.3 algae test) is proposed for FeSi-grades (< 1 mm and < 0.05 µm if relevant) up to load of 1000 mg/l.

Test material FeSi – grade(s) & particle size to be determined
Test organisms green algae
Test method OECD 201/C.3 Alga, Growth Inhibition Test
Endpoint EC50 (growth rate/biomass), EC10/NOEC
Test duration 72 hr
Sample preparation Following the guideline
Test concentrations method stipulates ≥ 5 concentrations or limit test (poorly soluble subst)

Test material

Test material information

Constituent 1

Reference substance name:

Ferrosilicon

EC Number:

912-631-7

Cas Number:

12022-95-6

Molecular formula:

FeSi; FeSi2; Fe2Si

IUPAC Name:

Ferrosilicon