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Preparation and characterization of metal-organic framework MIL-101(Cr)-coated solid-phase microextraction fiber.

Analytica chimica acta (2014-12-04)
Lijun Xie, Shuqin Liu, Zhubing Han, Ruifen Jiang, Hong Liu, Fang Zhu, Feng Zeng, Chengyong Su, Gangfeng Ouyang
ABSTRACT

Metal-organic frameworks (MOFs) have received great attention as novel sorbents due to their fascinating structures and intriguing potential applications in various fields. In this work, a MIL-101(Cr)-coated solid-phase microextraction (SPME) fiber was fabricated by a simple direct coating method and applied to the determination of volatile compounds (BTEX, benzene, toluene, ethylbenzene, m-xylene and o-xylene) and semi-volatile compounds (PAHs, polycyclic aromatic hydrocarbons) from water samples. The extraction and desorption conditions of headspace SPME (HS-SPME) were optimized. Under the optimized conditions, the established methods exhibited excellent extraction performance. Good precision (<7.7%) and low detection limits (0.32-1.7 ng L(-1) and 0.12-2.1 ng L(-1) for BTEX and PAHs, respectively) were achieved. In addition, the MIL-101(Cr)-coated fiber possessed good thermal stability, and the fiber can be reused over 150 times. The fiber was successfully applied to the analysis of BTEX and PAHs in river water by coupling with gas chromatography-mass spectrometry (GC-MS). The analytes at low concentrations (1.7 and 10 ng L(-1)) were detected, and the recoveries obtained with the spiked river water samples were in the range of 80.0-113% and 84.8-106% for BTEX and PAHs, respectively, which demonstrated the applicability of the self-made fiber.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Toluene, anhydrous, 99.8%
Sigma-Aldrich
Toluene, ACS reagent, ≥99.5%
Sigma-Aldrich
Benzene, anhydrous, 99.8%
Sigma-Aldrich
Toluene, suitable for HPLC, 99.9%
Supelco
Benzene, analytical standard
Sigma-Aldrich
Toluene, HPLC Plus, for HPLC, GC, and residue analysis, ≥99.9%
Sigma-Aldrich
Benzene, suitable for HPLC, ≥99.9%
Sigma-Aldrich
Benzene, ACS reagent, ≥99.0%
Sigma-Aldrich
m-Xylene, anhydrous, ≥99%
Sigma-Aldrich
Ethylbenzene, anhydrous, 99.8%
Sigma-Aldrich
o-Xylene, anhydrous, 97%
Supelco
Toluene, analytical standard
Sigma-Aldrich
Toluene, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., ≥99.7% (GC)
Sigma-Aldrich
o-Xylene, puriss. p.a., ≥99.0% (GC)
Supelco
Ethylbenzene, analytical standard
Supelco
Benzene, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
o-Xylene, reagent grade, ≥98.0%
Supelco
o-Xylene, analytical standard
Supelco
Toluene, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
Benzene, puriss. p.a., reag. Ph. Eur., ≥99.7%
Supelco
m-Xylene, analytical standard
Supelco
o-Xylene, suitable for HPLC, 98%
Sigma-Aldrich
Toluene, ACS reagent, ≥99.5%
Sigma-Aldrich
Toluene, Laboratory Reagent, ≥99.3%
Supelco
Residual Solvent - Toluene, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
Ethylbenzene, ReagentPlus®, 99%
Sigma-Aldrich
m-Xylene, ReagentPlus®, 99%
Sigma-Aldrich
m-Xylene, puriss. p.a., ≥99.0% (GC)
Sigma-Aldrich
Rhein
Supelco
o-Xylene, Pharmaceutical Secondary Standard; Certified Reference Material