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EC number: 231-970-5 | CAS number: 7782-91-4
Toxicity to soil macroorganisms except arthropods
Administrative data
Link to relevant study record(s)
Description of key information
A total of 10 topsoils with contrasting properties that may affect the toxicity of Mo in soil were used for testing 2 toxicity assays with annelid worms (reproduction for Enchytraeus crypticus and Eisenia andrei ) after spiking with sodium molybdate. In addition, an OECD artificial soil was also tested.
The annelid toxicity assays resulted in 20 individual high quality NOEC/EC10. The NOEC/EC10 values ranged from 7,88 to 1661 mg added Mo/kg dry weight soil.
Additionally, 3 soils were aged outdoors after spiking with sodium molybdate. After 6 and 11 months, subsamples were collected and the same ecotoxicity tests as above were conducted on these soils. In general, this showed that long-term equilibration of Mo in soils decreases its toxicity to annelids.
Key value for chemical safety assessment
Additional information
The invertebrate toxicity assays (excluding arthropods) resulted in 20 individual high quality NOEC/EC10 values (for 2 different invertebrates; Enchytraeus crypticus and Eisenia andrei).
The selected NOEC/EC10 values range from 7,88 mg added Mo/kg for E. andrei in soil 6 to 1661 mg added Mo/kg for E.crypticus in soil 7. All data are based on added measured Mo concentrations in dry weight soil.
For E. crypticus, unbounded NOEC values were observed in soils 1 and 9 (EC10> 2719 and 2816 mg added Mo/kg dw soil respectively).
For the aged soils (soils 4,5 and 6), the comparison of Mo in freshly spiked and 11 -month aged soils show that long-term equilibration of Mo in soils generally decreases its toxicity to invertebrates. Only in one case (out of 6 cases) an effect at a lower dose was observed in the aged soil (E. crypticus in soil 6).
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