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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to soil microorganisms

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Administrative data

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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.

Key value for chemical safety assessment

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