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Toxicity to aquatic algae and cyanobacteria

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Description of key information

Several lines of evidence indicate that aquatic toxicity of tantalum carbide is unlikely to occur.

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Additional information

Several lines of evidence indicate that aquatic toxicity of tantalum carbide is unlikely to occur. Tantalum carbide is highly insoluble in water. The maximum water solubility of the substance analysed under the conditions of the T/D test (OECD Series on Testing and Assessment No. 29) was 0.333 µg/L after 7 days at 21.5 °C and a loading of 100 mg/L. The water solubility of tantalum carbide at environmentally relevant temperatures and reduced exposure time (48/72 h in test evaluating the acute toxicity to aquatic invertebrates/algae) is assumed to be even lower. Furthermore, no adverse effects could be observed in available tests investigating the toxicity towards fish and soil invertebrates at 100 mg/L and 1000 mg/kg soil dw, respectively.

Conclusion: Based on the very low water solubility and very low bioavailability, toxic effects in aquatic organisms are not expected. Available results (fish, soil invertebrates) do not give rise to any concern. The non-toxicity of TaC is further supported by results available from read-across partners (Ta, TaCl5).

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