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Environmental fate & pathways

Biodegradation in water: screening tests

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1-ETHYL-3-METHYL IMIDAZOLIUM ETHYLSULFATE is not readily biodegradable under the conditions of the modified Sturm test. Furthermore, TEGO IL IMES demonstrated low potential for inherent biodegradation with 11.3 - 13.2 % biodegradation after 28 d.

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Determination of 'ready' biodegradability: carbon dioxide (CO2) evolution test (modified Sturm test) with 1-ETHYL-3-METHYL IMIDAZOLIUM ETHYLSULFATE. The study procedure was based on EEC directive 92/69, CA-C, December 1992, and OECD guideline No. 301 B .July 17, 1992. The Theoretical CO2 production (ThCO2) of 1-ETHYL-3-METHYL IMIDAZOLIUM ETHYLSULFATE was calculated to be 1.49 mg C02/mg. The batch of 1-ETHYL-3-METHYL IMIDAZOLIUM ETHYLSULFATE tested was a light yellow viscous liquid. 1-ETHYL-3-METHYL IMIDAZOLIUM ETHYLSULFATE was tested in duplicate at 12 mg TOC/L. The organic carbon content was based on the molecular formula. The study consisted of six bottles: 2 blank controls (no test material), 2 test bottles (1-ETHYL-3-METHYL IMIDAZOLIUM ETHYLSULFATE, 30 mg/l), 1 positive control (sodium acetate, 40 mg/l) and 1 toxicity control (1-ETHYL-3-METHYL IMIDAZOLIUM ETHYLSULFATE, 30 mg/l; plus sodium acetate, 40 mg/l). Since 1-ETHYL-3-METHYL IMIDAZOLIUM ETHYLSULFATE was easily soluble in water the test media were prepared using a stock solution of 1 g/l in Milli-RO water (tap water purified by reverse osmosis; Millipore Corp., Bedford, Mass., USA). A weighed amount of 1009.5 mg of 1-ETHYL-3-METHYL IMIDAZOLIUM ETHYLSULFATE was dissolved in Milli-RO water and made up to 1000 ml. Aliquots of 59 ml of the stock solution were added to the test medium, containing the microbial organisms, of test substance bottles A and B and the toxicity control. The test solutions were continuously stirred during the test, to ensure optimal contact between the test substance and the test organisms. The relative degradation values calculated from the measurements performed during the test period revealed no significant degradation of 1-ETHYL-3-METHYL IMIDAZOLIUM ETHYLSULFATE. In the toxicity control 1-ETHYL-3-METHYL IMIDAZOLIUM ETHYLSULFATE was found not to inhibit microbial activity. Since all criteria for acceptability of the test were met, this study was considered to be valid. In conclusion, 1-ETHYL-3-METHYL IMIDAZOLIUM ETHYLSULFATE was not readily biodegradable under the conditions of the modified Sturm test presently performed.

Furthermore, 1-ETHYL-3-METHYL IMIDAZOLIUM ETHYLSULFATE demonstrated low potential for inherent biodegradation with 11.3 - 13.2 % biodegradation after 28 d.