4.6 Article

Hollow fiber supported ionic liquid membrane microextraction for speciation of mercury by high-performance liquid chromatography-inductively coupled plasma mass spectrometry

期刊

ANALYTICAL METHODS
卷 7, 期 3, 页码 1140-1146

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ay02408g

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资金

  1. Projects of National Natural Science Foundation of P.R. China [21277084, 21207059]
  2. Promotive Research Fund for Young and Middle-aged Scientists of Shandong Province, China [BS2012HZ012]
  3. Projects of Upgrade and Regeneration of Scientific Instruments of Shandong Province, China [2013SJGZ08]
  4. State Key Laboratory of Environmental Chemistry and Ecotoxicity
  5. Research Center for Eco-Environmental Science
  6. Chinese Academy of Sciences [KF2011-17]
  7. Doctor Funds of Shandong Academy of Sciences
  8. Shandong Analysis and Testing Center

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With an ionic liquid as the membrane liquid and dithizone as the carrier, a novel and simple hollow fiber supported liquid phase microextraction (HF-LPME) method was developed for the preconcentration and determination of monomethylmercury (MMHg) and inorganic mercury (IHg) in environmental water samples by high-performance liquid chromatography-inductively coupled plasma mass spectrometry (HPLC-ICP-MS). The parameters affecting the enrichment factors, including the type of ionic liquid membrane and carrier, the pH of the sample solution, the concentration of L-cysteine in the acceptor phase, stirring rate, extraction temperature and time, were optimized. With the optimal extraction conditions (ionic liquid membrane phase: [C4MIM][PF6] with 0.02% (m/v) dithizone; acceptor phase: 25 mu L, 1 g L-1 L-cysteine; extraction temperature: 50 degrees C; extraction time:12 h), the obtained enrichment factors of MMHg and IHg were 1620 and 1540, and the detection limits for MMHg and IHg were 0.3 ng L-1 and 0.9 ng L-1, respectively. There was no significant effect on the extraction efficiency in the presence of humic acid (0-25 mg L-1 dissolved organic carbon). The proposed method was applied to real water samples, and the spike recoveries obtained were in the range 90.8-108.2%. These results demonstrate that the proposed ionic liquid based HF-LPME-HPLC-ICP-MS method is a simple and sensitive technique for the determination of mercury species at trace levels in water samples, with a high reproducibility and accuracy.

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