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EC number: 289-178-0 | CAS number: 86089-09-0
Toxicity to terrestrial arthropods
Administrative data
Link to relevant study record(s)
Description of key information
A total of ten 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 three individual high quality NOEC/EC10 selected for PNEC derivation. In the other eight soils, no toxic effect was observed at the largest dose tested. The bounded NOEC/EC10 values ranged from 37.9 to 1,865 mg added Mo/kg dry weight soil.
Additionally, three 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. The ageing data for the arthropod could not be used for deriving a Leaching/Ageing factor given that already in the spiked soils, no effects were observed.
Key value for chemical safety assessment
Additional information
The arthropod invertebrate toxicity assay used Folsomia candida as a test species. Only three soils resulted in reliable, bounded NOEC values. In all eight other soils, no toxic effect was observed at the largest dose tested (unbounded NOEC values between >2,628 and 3,395 mg added Mo/kg dw. the reliable NOEC/EC10 values taken forward for the PNEC derivation ranged from 37.9 to 1865 mg added Mo/kg dw. All data are based on added measured Mo concentrations in soil. Little could be concluded regarding the results of the three aged soils given that already in the spiked soils, no effects were observed. In one of the three aged soils, an effect was noted, although at a concentration greater than the unbounded NOEC in the spiked soil.
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