Registration Dossier
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EC number: 244-214-4 | CAS number: 21109-95-5
Toxicity to terrestrial arthropods
Administrative data
Link to relevant study record(s)
Description of key information
Reliable chronic toxicity data for soil dwelling arthropods are available for barium. Toxic effects of released sulfide from BaS are not relevant for the hazard assessment of BaS in soils as sulfide is oxidized to sulfate. However, sulfate is of low toxicity. Therefore, the soil hazard assessment is based on barium. The NOEC value of 211 mg Ba/kg soil dw corresponds to 260.3 mg BaS/kg soil dw.
Key value for chemical safety assessment
- Long-term EC10, LC10 or NOEC for soil dwelling arthropods:
- 260.3 mg/kg soil dw
Additional information
Reliable toxicity data for arthropods are available for barium, but not for sulfide or sulfate.
Toxic effects of released sulfide from BaS are not relevant for the hazard assessment of BaS in soils as sulfide is oxidized to sulfate, and thus the toxicity of sulfate should be assessed. Sulfate is essential to all living organisms, their intracellular and extracellular concentrations are actively regulated and thus, sulfates are of low toxicity to the environment, including soils (OECD SIDS for Na2SO4). Thus, the barium cation is the moiety of toxicological concern, and the soil hazard assessment is based on barium.
Kuperman et al (2006) reported a reliable NOEC value for barium toxicity to the arthropodF. candida. The NOEC-values were derived for the ecological relevant endpoints mortality and reproduction with reproduction being the most sensitive endpoint. The lowest NOEC value amounts to 211 mg Ba/kg soil dw corresponding to 260.3 mg BaS/kg soil dw.
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