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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Description of key information

LC50 (14d) = 140 mg a.i./kg dw soil (Eisenia fetida)
NOEC (28d-mortality and reproduction) = 4 kg Ziram 76 WG/ha = 4.053 mg a.i./kg dw soil (Eisenia fetida)

Key value for chemical safety assessment

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The toxicity of zinc bis dimethyldithiocarbamate (CAS No. 137-30-4) to earthworms was investigated in two studies. The test performed by Handley and Wetton (1993) was conducted according to OECD Guideline No. 207 (1984), Earthworm Acute Toxicity Test, under GLP conditions. Earthworms were exposed for 14 days to the test material in artificial soil at concentrations ranging from 100 to 1000 mg a.i./kg dry weight soil. The resulting LC50 was determined to be 140 mg a.i./kg dry weight soil.

Wachter (1999) investigated the chronic effects of zinc bis dimethyldithiocarbamate in earthworms. This study was performed according to the Draft ISO-Guideline 11268-2 (1993) and BBA Guideline, part VI, 2-2 (1995), under GLP conditions. Effects on survival and biomass were determined after 28 days of exposure, followed by an additional 28-days period where reproduction-related effects were assessed. No mortality was reported at any concentration tested. Adverse effects on reproduction (based on number of offsprings) were observed only at the highest concentration 20 kg formulation/ha. The NOEC was 4.053 mg a.i./kg dw soil (4 kg formulation/ha).