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EC number: 231-970-5 | CAS number: 7782-91-4
Toxicity to terrestrial 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 a toxicity assay with the arthropod invertebrate, Folsomia candida, after spiking with sodium molybdate. In addition, an OECD artificial soil was also tested.
The arthropod toxicity assay resulted in only 3 individual high quality NOEC/EC10. In the other 8 soils, no toxic effect was observed at the largest dose tested. The bounded NOEC/EC10 values ranged from 37,9 to 1865 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.
Key value for chemical safety assessment
Additional information
For the arthropod invertebrate toxicity assay, Folsomia candida was used as a test species. Only 3 soils resulted in reliable, bounded NOEC values. In all 8 other soils, no toxic effect was observed at the largest dose tested (unbounded NOEC values between >2628 and 3395 mg added Mo/kg dw. the reliable NOEC/EC10 values ranged from 37.9 to 1865 mg added Mo/kg dw. All data are based on added measured Mo concentrations in soil.
Not much could be concluded regarding the results of the 3 aged soils given that already in the spiked soils, no effects were observed. In one of the 3 aged soils, an effect was noted, although at a concentration greater than the unbounded NOEC in the spiked soil.
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