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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

No studies on SFL are available.
The key study was conducted on an analogous substance and assessed the effect of calcium carbonate (nano) on the nitrogen transformation activity of soil microorganisms in a GLP study performed in accordance with OECD Guideline 216. The 28 day EC50 was >1000 mg/kg soil dw and the NOEC was 1000 mg/kg soil dw.
The result from this study demonstrates that calcium carbonate is not toxic to soil microorganisms and can be read across to SFL.

Key value for chemical safety assessment

Additional information

Rationale for read across:

SFL is primarily composed of inorganic substances. The major constituent is calcium carbonate, along with silicon dioxide and a small amount of other inorganic salts (including calcium salts) and the remainder is composed of organic plant material. None of the components of SFL carry a classification for physical chemical properties or the environment and therefore SFL is not classified as hazardous to the environment. Since the major component of SFL is calcium carbonate, it can therefore be assumed that the properties of SFL will be governed by those of calcium carbonate. It is therefore considered appropriate for this data to be used for read-across purposes and any further testing would be scientifically unjustified.

The key study [Clarke (2010)] was performed to OECD Guideline 216 and in accordance with GLP and was therefore assigned a reliability of 1. The study assessed the effect of calcium carbonate (nano) on the nitrogen transformation activity of soil microorganisms at a nominal concentration of 1000 mg/kg. No adverse effects on the nitrogen transformation rate were exhibited at the concentration tested. Hence, the 28 day EC50 for calcium carbonate (nano) was found to be >1000 mg/kg soil dw and the NOEC was 1000mg/kg soil dw.

Calcium carbonate is therefore not toxic to soil microorganisms. Since this study can be read across to SFL, it is expected that SFL would also not be toxic to soil microorganisms.