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Toxicity to soil microorganisms

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Description of key information

On a molecular weight scaled basis, the 1d EC50 would be 22.6 mg/kg soil dw. (10x 172.24) /76.13 =22.6 mg/kg soil dw
After fumigation of soils with CS2 the microbial metabolism of soil was seriously affected. At 10 mg CS2/kg the nitrification was completely inhibited.

Key value for chemical safety assessment

Short-term EC50 for soil microorganisms:
22.6 mg/kg soil dw
Long-term EC10 or NOEC for soil microorganisms:
0.95 mg/kg soil dw

Additional information

On a molecular weight scaled basis, the EC50 would be 22.6 mg/kg soil dw. (10x 172.24) /76.13 =22.6 mg/kg soil dw After fumigation of soils with CS2 the microbial metabolism of soil was seriously affected. At 10 mg CS2/kg the nitrification was completely inhibited.

The nitrification in three soil types was inhibited by CS2. The 5-d EC50 in Harps clay loam soil was 0.21 mg/kg soil dw and the 14-d EC50 was 2.1 mg/kg soil dw.

On a molecular weight scaled basis, the EC50 would be 4.75 mg/kg soil dw. (2.1 x 172.24) /76.13 =4.75 mg/kg soil dw(NOEC=0.95 mg/kg soil)