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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

28 d NOEC (nitrate transformation) = 12.8 mg/kg soil DW; OECD guideline 216, RL1, GLP; read-across from C20/22 ATQ

Key value for chemical safety assessment

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

Additional information

No experimental data are available for C16-18 DMAPA amidoamine. However, studies are available with the source substance C20/22 ATQ. For justification for read-across see endpoint summary "Terrestrial toxicity".

 

C20/22 ATQ was tested in a Nitrogen Transformation Testaccording to OECD Guideline 216. After 7 days of exposure the EC25-value for inhibition of the nitrate-N formation rate in soil was 22.0 mg/kg soil dry weight. After 7 days the inhibition of nitrate transformation was below 50 % at all test item concentrations resulting in an EC50-value > 500 mg/kg soil dry weight. The NOEC for nitrate transformation in soil on day 7 was determined to be 12.8 mg/kg soil dry weight.

After 14 days of exposure the EC25-value for inhibition of the nitrate-N formation rate in soil was 32 mg/kg soil dry weight. The EC50for inhibition of the nitrate transformation was determined to be at 176 mg/kg soil dry weight. The NOEC for nitrate transformation in soil on day 14 was set at 12.8 mg/kg soil dry weight.

After 28 days of exposure the following EC-values for inhibition of the nitrate-N formation rate were determined: EC12.5: 16.6 mg/kg soil dry weight, EC25: 49.5 mg/kg soil dry weight, EC50: 76.0 mg/kg soil dry weight. The NOEC for nitrate transformation in soil on day 28 was set 12.8 mg/kg soil dry weight.