Journal
ANALYTICA CHIMICA ACTA
Volume 715, Issue -, Pages 113-119Publisher
ELSEVIER
DOI: 10.1016/j.aca.2011.12.004
Keywords
Chlorophenols; Fe3O4 magnetic nanoparticles; Ionic liquid; Solid-phase extraction; Mixed hemimicelles
Categories
Funding
- National Natural Science Foundation of China [20975083]
- Municipal Science Foundation of Chongqing City [CSTC-2008BB 4013]
- Southwest University [211]
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In this paper, 1-hexadecyl-3-methylimidazolium bromide (C(16)mimBr)-coated Fe3O4 magnetic nanoparticles (NPs) as an adsorbent of mixed hemimicelles solid-phase extraction was investigated for the preconcentration of two chlorophenols (CPs) in environmental water samples prior to HPLC with UV detection at 285 nm. The high surface area and excellent adsorption capacity of the Fe3O4 NPs after modification with C(16)mimBr were utilized adequately in the SPE process. By the rapid isolation of Fe3O4 NPs through placing a strong magnet on the bottom of beaker, the time-consuming preconcentration process of loading large volume sample in conventional SPE method with a column can be avoided. A comprehensive study of the adsorption conditions such as the zeta-potential of Fe3O4 NPs, added amounts of C(16)mimBr, pH value, standing time and maximal extraction volume were also presented. Under optimized conditions, two analytes of 2,4-dichlorophenol (2,4-DCP) and 2,4,6-trichlorophenol (2,4,6-TCP) were quantitatively determined. The method was then used to determine the two CPs in real environmental water samples. The accuracy of method was evaluated by recovery measurements on spiked samples. Good recovery results (74-90%) were achieved. It is important to note that satisfactory preconcentration factors and extraction recoveries for the two CPs were obtained with only a small amount of Fe3O4 NPs (40 mg) and C(16)mimBr (24 mg). (C) 2011 Elsevier B.V. All rights reserved.
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