Author(s): Cheng Q, Qu F, Li NB, Luo HQ
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Abstract In this paper, 1-hexadecyl-3-methylimidazolium bromide (C(16)mimBr)-coated Fe(3)O(4) 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 Fe(3)O(4) NPs after modification with C(16)mimBr were utilized adequately in the SPE process. By the rapid isolation of Fe(3)O(4) 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 Fe(3)O(4) 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 Fe(3)O(4) NPs (40 mg) and C(16)mimBr (24 mg). Copyright © 2011 Elsevier B.V. All rights reserved.
This article was published in Anal Chim Acta
and referenced in Journal of Chromatography & Separation Techniques