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EC number: 237-048-9
CAS number: 13597-46-1
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).
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
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