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Diss Factsheets

Ecotoxicological information

Toxicity to soil microorganisms

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Administrative data

Link to relevant study record(s)

Description of key information

NOEC (56d) = 40 kg/ha (30.4 kg a.i./ha)

Key value for chemical safety assessment

Additional information

No information about the toxicity of KDDC (CAS No. 128-03-0) to soil microorganisms was available. Therefore, a conclusion about this endpoint had to be drawn based on toxicity data from an analogue substance. The effects of ziram (CAS No. 137-30-4) to soil microorganisms were investigated in a study (Wachter, 1999). This test was conducted according to BBA Guideline, Part VI, 1-1 (1990), under GLP conditions. The test material was incubated in two different soil types (sandy and sandy loam) for 56 days at two concentration rates (4 kg/ha (3.04 kg a.i./ha) and 40 kg/ha (30.4 kg a.i./ha)). The results found in the treatment groups regarding nitrogen turnover (measured as inorganic nitrogen content after 28 days) and short term respiration rates did not differ significantly from those in the controls. Therefore, the impact of this substance on soil microorganisms activity can be considered as negligible (NOEC (56d): 30.4 kg a.i./ha).