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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

Tungsten dioxide was not tested for toxicity to soil micro-organisms and read-across to sodium tungstate was used for this endpoint. In both a Carbon and a Nitrogen Transformation Test using sodium tungstate the 28-day EC50 was found to be > 1000 mg/kg soil d.w. (sodium tungstate concentration) (nominal)  (approximately  626 mg W/kg).

Key value for chemical safety assessment

Long-term EC10 or NOEC for soil microorganisms:
626 mg/kg soil dw

Additional information

Due to similar or lower transformation/dissolution results for tungsten dioxide (the target substance) than sodium tungstate (the source substance), the resulting toxicity potential would also be expected to be similar or lower, so read-across is appropriate. Therefore, the dose descriptors are expected to be sufficiently similar or higher for the target substance, and read-across to the source chemical is adequately protective. For more details refer to the attached description of the read-across approach.