title: Temperature-controlled ionic liquid-dispersive liquid-phase microextraction for preconcentration of chlorotoluron, diethofencarb and chlorbenzuron in water samples.
abstract: This article describes a new, rapid and sensitive method for the determination of chlorotoluron, diethofencarb and chlorbenzuron from water samples with temperature-controlled ionic liquid-dispersive liquid-phase microextraction. In the preconcentration procedure, ionic liquid 1-hexyl-3-methylimidazolium hexafluorophosphate [C(6)MIM] [PF(6)] was employed as the extraction solvent. The parameters, such as volume of [C(6)MIM] [PF(6)], sample pH, extraction time, centrifuging time, temperature and salting-out effect, were investigated in detail. Under the optimal extraction conditions, it has been found that three analytes had excellent LODs (S/N=3) in the range of 0.04-0.43 microg/L. The RSDs (n=6) were in the range of 1.3-4.7%. The proposed method was evaluated with lake water, tap water and melted snow water samples. The experimental results indicated that the proposed method had excellent prospect and would be widely used in the future.
authors.affiliation: School of Chemistry and Environmental Sciences, Henan Normal University, Henan Key Laboratory for Environmental Pollution Control, Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control, Ministry of Education, Xinxiang, PR China. zhouqx@henannu.edu.cn
authors.forename: Qingxiang
authors.initials: Q
authors.lastname: Zhou
authors.forename: Xiaoguo
authors.initials: X
authors.lastname: Zhang
authors.forename: Guohong
authors.initials: G
authors.lastname: Xie
authors.forename: Junping
authors.initials: J
authors.lastname: Xiao
mesh_terms: D002722:Chlorobenzenes / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D007094:Imides / Q000032:analysis*; D007477:Ions; D057230:Limit of Detection; D048448:Phenylcarbamates / Q000032:analysis*; D010671:Phenylurea Compounds / Q000032:analysis*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D002722:Chlorobenzenes; D007094:Imides; D007477:Ions; D048448:Phenylcarbamates; D010671:Phenylurea Compounds; D014874:Water Pollutants, Chemical; C000608332:chlorbenzuron; C070961:diethofencarb; C007033:chlortoluron