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Nanofiber Enabled, Multi - Target Passive Sampling Device for Determination of the Freely Dissolved Sediment Pore Water Concentrations of Organic Contaminants

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Technical Report,01 May 2015,01 Jun 2016

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The University of Iowa Iowa City United States

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We used electrospinning to fabricate a suite of electrospun nanofiber mats ENMs and test their sorption capacities to a set of hydrophilic aniline and nitrobenzene and hydrophobic compounds PCBs and Dioxin to be used as next-generation multi-target passive samplers. The average diameter of the ENMs ranged from 70 PET to 1,000 EVA nm, with a relative standard deviation of less than 50 for each material. Our ENMs in water yielded a fast equilibration time 3 days for our tested hydrophilic and hydrophobic compounds. The ENM-water partition coefficient KENM-w for the hydrophilic compounds ranged from 0.72 to 2.8 log units, with evidence suggesting uptake via partitioning into the bulk nanofiber i.e. absorption and specific binding interactions e.g., H-bonding and Coulombic interactions contributing to, and potentially controlling, hydrophilic uptake. The KENM-w for hydrophobic compounds ranged from 3.2 to 6.4 log units. Collectively, the rates and KENM-w measured for the best performing ENMs often exceeded partition coefficients achieved with commercially available passive sampling materials e.g., low-density polyethylene and PDMS glass fiber, particularly for hydrophilic compounds. Overall, our results support our initial hypothesis that electrospun nanofiber mats represent next-generation passive sampling materials that can be easily modified to enhance compound selectivity, sorption capacities and improve field applications.

Subject Categories:

  • Miscellaneous Materials
  • Polymer Chemistry

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