title: Fast microextraction of phthalate acid esters from beverage, environmental water and perfume samples by magnetic multi-walled carbon nanotubes.
abstract: In this work, magnetic carbon nanotubes (CNTs) were prepared by mixing the magnetic particles and multi-walled carbon nanotubes dispersed solutions. Due to their excellent adsorption capability towards hydrophobic compounds, the magnetic CNTs were used as adsorbent of magnetic solid-phase extraction (MSPE) to extract phthalate acid esters (PAEs), which are widely used in many consumable products with potential carcinogenic properties. By coupling MSPE with gas chromatography/mass spectrometry (GC/MS), a rapid, sensitive and cost-effective method for the analysis of PAEs was established. Our results showed that the limits of detection (LODs) of 16 PAEs ranged from 4.9 to 38 ng L(-1), which are much lower compared to the previously reported methods. And good linearities of the detection method were obtained with correlation coefficients (R(2)) between 0.9821 and 0.9993. In addition, a satisfying reproducibility was achieved by evaluating the intra- and inter-day precisions with relative standard deviations (RSDs) less than 11.7% and 14.6%, respectively. Finally, the established MSPE-GC/MS method was successfully applied to the determination of PAEs from bottled beverages, tap water and perfume samples. The recoveries of the 16 PAEs from the real samples ranged from 64.6% to 125.6% with the RSDs less than 16.5%. Taken together, the MSPE-GC/MS method developed in current study provides a new option for the detection of PAEs from real samples with complex matrices.
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan 430072, China.
authors.forename: Yan-Bo
authors.initials: YB
authors.lastname: Luo
authors.forename: Qiong-Wei
authors.initials: QW
authors.lastname: Yu
authors.forename: Bi-Feng
authors.initials: BF
authors.lastname: Yuan
authors.forename: Yu-Qi
authors.initials: YQ
authors.lastname: Feng
mesh_terms: D000327:Adsorption; D001628:Beverages / Q000032:analysis*; D004777:Environment; D004952:Esters / Q000032:analysis* / Q000302:isolation & purification; D008401:Gas Chromatography-Mass Spectrometry; D008280:Magnetics; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010476:Perfume / Q000032:analysis*; D010795:Phthalic Acids / Q000032:analysis* / Q000302:isolation & purification; D052616:Solid Phase Extraction; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D004952:Esters; D037742:Nanotubes, Carbon; D010476:Perfume; D010795:Phthalic Acids; D014874:Water Pollutants, Chemical; C032279:phthalic acid