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Environmental Impact of Ionic Liquids: Automated Evaluation of the Chemical Oxygen Demand of Photochemically Degraded Compounds.

Chemphyschem : a European journal of chemical physics and physical chemistry (2017-02-22)
Susana P F Costa, Sarah A P Pereira, Paula C A G Pinto, André R T S Araujo, Marieta L C Passos, M Lúcia M F S Saraiva
ABSTRACT

A novel automated fluorimetric technique was developed for the assessment of the chemical oxygen demand (COD) of ionic liquids (ILs) and combined with a photodegradation step to promote IL degradation. The method was implemented on a sequential injection analysis (SIA) system and is based on the reduction of cerium(IV) in the presence of irradiated ILs. Compounds incorporating the chloride anion were found to exhibit higher COD values and 1-butyl-3-methylimidazolium chloride ([bmim]

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
1-Butyl-3-methylimidazolium tetrafluoroborate, ≥98%
Sigma-Aldrich
1-Ethyl-3-methylimidazolium acetate, 97%
Sigma-Aldrich
1-Butyl-1-methylpyrrolidinium tetrafluoroborate, ≥97.0% (T)
Sigma-Aldrich
Tetrabutylammonium chloride, ≥97.0% (NT)
Sigma-Aldrich
1-Ethyl-3-methylimidazolium methanesulfonate, ≥95%