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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

In a 28-day toxicity study on the soil nitrogen transformation activity, natural soil was exposed to the test substance, Fatty acids, C12-14, a-sulfo, disodium salts at nominal concentrations of 0 (blank control), 62.5 mg/kg, 125 mg/kg, 250 mg/kg, 500 mg/kg and 1000 mg/kg (dry weight) under conditions in accordance with the guidelines. Lucerne meal was used as the additional nitrogen source. Nitrate formed during microbial processes was determined at the start of exposure (Day 0), after 7, 14 and at the end of exposure (Day 28) and were compared to control assays of the corresponding days. For the evaluation of results, decrease of nitrate in the treated replicates is expressed as an inhibition of test substance on the N mineralization process. Likewise, an increase in the nitrate in the treated samples is expressed as a stimulation effect of the test substance on the process of nitrogen oxidation in soil.

Because the degree of inhibition at 1000 mg/kg Dw was less than 25 % at the end of exposure according to the OECD guideline 216, Fatty acids, C12-14, a-sulfo,disodium salts can be evaluated as having no long-term influence on nitrogen transformation in soils.

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