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Nanostructured molybdenum oxide in a 3D metal organic framework and in a 2D polyoxometalate network for extraction of chlorinated benzenes prior to their quantification by GC–MS

Bagheri, H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s00604-018-3070-5
  3. Abstract:
  4. A three–dimensional metal organic framework (3D–MOF) and a two–dimensional polyoxometalate (2D–POM), both incorporating nanostructured molybdenum (VI) oxide, were synthesized and implemented for headspace needle trap extraction of traces of chlorobenzenes (CBs). The 3D–MOF of type {(Mo2O6)(4,4′–bpy)}n and the 2D–POM of type [4,4′–bpy][Mo7O22] were synthesized by a solvothermal process and characterized by FT–IR, powder X–ray diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetry, energy dispersive X–ray, elemental mapping and Brunner–Emmet–Teller adsorption analyses. The 3D–MOF proved to be superior. Following thermal desorption, the CBs (monochlorobenzene, 1,4–dichlorobenzene, 1,2–dichlorobenzene, 1,2,4–trichlorobenzene and 1,2,3,4-tetrachlorobenzene) were quantified by GC–MS. Under optimized conditions, the calibration plots are linear in the 1–1000 ng.L−1 concentration range, and the limits of detection range from 0.2 to 2 ng.L−1. The intra– and inter–day relative standard deviations for three replicates at levels of 10 and 200 ng.L−1 are in the range of 5–12% and 10–15%, respectively. The needle–to–needle reproducibility was also found to be in the range of 6–13%. The application of the method to the analysis of various spiked real water samples resulted in recoveries between 84 and 114%. [Figure not available: see fulltext.]. © 2018, Springer-Verlag GmbH Austria, part of Springer Nature
  5. Keywords:
  6. 4,4′–bypyridine ; Headspace sampling ; Metal organic framework ; Molybdenum oxide ; Needle trap extraction ; Polyoxometalate
  7. Source: Microchimica Acta ; Volume 185, Issue 12 , 2018 ; 00263672 (ISSN)
  8. URL: https://link.springer.com/article/10.1007%2Fs00604-018-3070-5