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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

EC50 carbon transformation: >1000 kg/kg soil dw (OECD 217, Schulz 2013)
NOEC carbon transformation: 1000 kg/kg soil dw (OECD 217, Schulz 2013)
EC50 nitrogen transformation: >1000 kg/kg soil dw (OECD 216, Schulz 2013)
NOEC nitrogen transformation: 1000 kg/kg soil dw (OECD 216, Schulz 2013)

Key value for chemical safety assessment

Short-term EC50 for soil microorganisms:
1 000 mg/kg soil dw
Long-term EC10 or NOEC for soil microorganisms:
1 000 mg/kg soil dw

Additional information

In a GLP and guideline compliant study a Nitrogen Transformation Test (OECD 216) and a Carbon Transformation Test (OECD 217) have been conducted (Klimisch 1). The results are considered reliable and adequate for risk assessment. A NOEC from such a 28 day test can be considered as a long-term result for microbial populations.

In addition the influence of cloquintocet-mexyl on soil microorganisms was investigated in a 28-day study performed according to the BBA Part VI, 1-1 guideline (Morgenroth, 1992). The study was GLP compliant and is considered to be reliable without restriction. However the maximum soil concentration tested was 0.27 mg/kg soil dw.