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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Description of key information

The lowest reliable EC10 for Na2SeO3 is 2.57 mg Se/kg soil (added concentration) for reproduction of Enchytraeus albidus after 6 weeks exposure, according to the OECD 220 guideline (Somogyi et al., 2007; Klimisch 1).

Key value for chemical safety assessment

Long-term EC10, LC10 or NOEC for soil macroorganisms:
2.57 mg/kg soil dw

Additional information

Reliable results are available for the toxicity of Na2SeO3 and Na2SeO4 to soil macro-organisms except arthropods. Somogyi et al. (2007) studied the effect of both Na2SeO3 and Na2SeO4 on mortality and reproduction of the potworm Enchytraeus albidus according to the OECD 220 guideline. There was a significant difference in toxicity between selenite and selenate, with selenate showing significantly higher toxicity. This is consistent with data for plants and the lower adsorption of selenate in soil compared to selenite. Therefore, only the available reliable results for selenite are taken into account for the hazard assessment of zinc selenite. The lowest reported EC10 for Na2SeO3 is 2.57 mg Se/kg soil for reproduction of Enchytraeus albidus after 6 weeks exposure (Somogyi et al., 2007; Klimisch 1). The lowest reported reliable NOEC for Na2SeO4 was 1.7 mg Se/kg soil (calculated as EC20/2) for reproduction of Eisenia fetida after 13 weeks exposure (Checkai et al., 2004; Klimisch 2; data not used for assessment of selenite).

All results are based on nominal added or background corrected measured Se concentrations.