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Long-term toxicity to aquatic invertebrates

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Description of key information

No long-term toxicity studies on aquatic invertebrates are available.

Key value for chemical safety assessment

Additional information

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) and the remainder is composed of organic plant material. SFL is not classified as harmful or toxic to the environment. The inorganic portion of SFL and the organic plant material are composed of substances which are naturally occurring in the environment. Hence, aquatic organisms including invertebrates are constantly exposed to the components of SFL without suffering from any adverse or detrimental effects.

An acute toxicity study to Daphnia magna was performed according to OECD 202 with the water-accommodated fraction (WAF) of 100 mg SFL/L medium.[Degussa (2007c)]. No toxic effects were seen at this test concentration. As a result, SFL is considered not acutely toxic to aquatic invertebrates and hence long term testing is considered to be unnecessary.

The study for SFL is supported by an acute toxicity study to Daphnia magna performed with calcium carbonate (nano) [Priestly (2010b)]. No toxic effects were seen when a 100% v/v saturated solution of calcium carbonate was tested. Hence, the 48 h EC50 was >100% v/v saturated solution and the NOEC was 100% v/v saturated solution. The concentration of calcium carbonate (nano) that might cause acute toxicity is therefore greater than the maximum solubility of calcium carbonate in water.