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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

Further experimental studies on the toxicity of diethyl carbonate to soil organisms are scientifically not justified.

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Additional information

In Annex IX of Regulation (EC) No 1907/2006, it is laid down that toxicity tests in soil organisms shall be proposed by the registrant if the chemical safety assessment indicates the need to investigate further the effects on soil organisms. According to Annex I of this regulation, the chemical safety assessment triggers further action when the substance or the preparation meets the criteria for classification as dangerous according to Directive 67/548/EEC or Directive 1999/45/EC or is assessed to be a PBT or vPvB. The hazard assessment for diethyl carbonate (DEC) reveals neither a need to classify the substance as dangerous to the environment, nor is it a PBT or vPvB substance, nor are there any further indications that the substance may be hazardous to the environment. DEC proved to be readily biodegradable in standard tests. A calculated bioconcentration factor of < 3 L/kg indicates that no bioaccumulation in the food chain is to be expected. Test results available for the acute and chronic toxicity of DEC to aquatic organisms (daphnia, algae, fish) report LC/EC50 and NOEC values in the range of 10-100 mg/l, thus indicating very low toxicity on exposed aquatic species. The conclusion of insignificant toxicity also to different soil organisms is supported by results from a fumigation test with 7 species of higher plants ( 3 h exposure) in which limit concentrations for the structurally related compound dimethyl carbonate (DMC) were found to be 10.000 (visible damage) and 3.000 mg/m³ (photosynthesis). For earthworms a 14 d LC50=4358.3 ppm was calculated using ECOSAR v1.00. This leads to the conclusion, that further experimental studies on the toxicity to soil organisms are not justified.