Registration Dossier

Diss Factsheets

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

Anthropogenic soil exposure can be considered negligible. There will only be some soil contamination due to atmospheric deposition of CS2 on the soil in the immediate vicinity of industry. CS2 has no affinity for soil and its evaporation half life in soil is short. In addition CS2 has a log Kow value of 2.7 and is readily degradable (either biotically or abiotically). Measured concentrations of CS2 in soil are therefore scarce and show low concentrations. The highest reported value was <1 µg/kg soil. If this value is compared with the PNEC for aquatic organisms (20 µg/L, see section 5.1) the PEC/PNEC ratio < 0.05. Therefore further testing with soil organims is not a requirement (See the guidance documents).

The 5-day EC50 for effects of CS2 on soil micro-organisms (measured in different soils in close flasks to prevent evaporation) was found to be 0.21 mg/kg and the 14 -d EC50 was 2.1 mg/kg. Plants exposed to CS2 in air showed a NOEC for wheat of 633 mg/m3, and 6.2 mg/m3 for Bush beans. These effect levels are much higher than the highest measured environmental concentrations in air (highest values ± 10 µg/m3, see section 5), so we do not expect effects on plants due to the exposure to environmental concentrations.