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Toxicity to soil microorganisms

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Description of key information

The terrestrial toxicity was predicted by a QSAR, the PETROTOX v4.0 computer model. PETROTOX is a well-documented and peer reviewed model that is widely used across the chemicals industry. The predicted EL50 values for Nitrobacter ranged from 3379 to 19823736 mg/kg soil dw. The predicted EL10 values for Nitrobacter ranged from 647 to 3797650 mg/kg soil dw.

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Additional information

The PETROTOX v4.0 model for sediment terrestrial organism calculates the constituent concentration in sediment or soil using the product composition (% mass) along with the total sediment/soil (s/s) loading rate (concentration of the full substance as added to the soil/sediment). The model then uses the equilibrium-partitioning calculations to convert aqueous-based effect concentrations (EC50, mmol/L) to soil or sediment based values (mmol/kg oc) for each constituent using the CTLBB for the soil or sediment organism. Then, it combines the s/s based concentration (mg/kg dw) and the effect concentrations in soil or sediment based values (mmol/kg oc) to compute toxic units for each constituent, which are then summed to determine the overall effect concentration (LC50ss) of the substance.
The predicted values were:
Species Carbon No. LL50 / EL50 (mg/kg_dw) EL10 (mg/kg_dw)
Nitrobacter C8 3379 647
Nitrobacter C12 91426 17515
Nitrobacter C16 19823736 3797650
Nitrobacter C20 19823736 3797650