Low cost polymeric material in sorptive microextraction

By R. Lucena -
The usefulness of sorptive microextraction approaches, like solid phase microextraction (SPME) or stir bar sorptive extraction (SBSE), in the isolation and preconcentration of organic pollutants from water is well established in the scientific literature. Classic SPME or SBSE are mainly focused on the extraction of non-polar compounds since the typical coating, polydimethlysiloxane (PDMS), is hydrophobic. While the main pollutants considered 20 years ago had a hydrophobic nature, most of the emerging contaminants present a medium to high polarity. Therefore, new sorptive phases are desirable in order to extend the scope of these extraction techniques.


In a article recently published in Analytica Chimica Acta, Prieto et al. evaluated the extraction performance of three polymeric materials, namely: polyethersulphone (PES), polypropylene (PP) and Kevlar (Kv). For this purpose 15 different analytes, covering a wide range of polarities, were evaluated as probes. In fact, the log Kow (Kow, octanol/water partition coefficient) were in the range between -0.07 and 6.88. In this research, the main variables involved in the extraction process are studied in depth for any type (polar and non-polar) of analyte. Moreover, the experimental results were also used to calculate the partition coefficient between the polymeric phase and water (Kpw) which can be useful for further applications. In this sense, PES presents the higher Kpw values compared to PDMS for almost all the analytes.

For more detailed information the readers are referred to the original article

Link to the article: Evaluation of low-cost disposable polymeric materials for sorptive extraction of organic pollutants in water

Comments

Post a Comment

Popular posts from this blog

Gold coated magnetic beads for electrochemical detection

By -
Image
This post summarizes an interesting article, recently accepted for publication in Analytical Chemistry, which presents an innovative use of magnetic beads. Researchers from the Osaka Prefecture University at Japan have proposed the synthesis of magnetic microbeads covered with a smooth gold layer that are used for the electrochemical detection of streptavidin (1). The synthesis, which is deeply described in the manuscript, consists of three well defined steps. First of all, the magnetic beads are introduced in a colloidal gold dispersion containing Au-nanoparticles (Au-NPs). Thanks to the opposite zeta potential of both materials (microbeads are negatively charged while Au-NPs present a positive charge), their assembly takes place by electrostatic interactions. However, the Au-NPs are not connected to each other and therefore the electrical resistance of the microbeads is too high. In a second step, the modified microbeads are dispersed in an aqueous medium containing HAuCl 4 as ...
Read more

Fabric phase sorptive extraction: a new generation green sample preparation strategy

By -
Image
by Dr. Abuzar Kabir, International Forensic Research Institute, Department of Chemistry and Biochemistry, Florida International University, Miami, Florida, USA Fabric phase sorptive extraction (FPSE), the most recent member of the sorptive microextraction family, has innovatively incorporated both solid phase microextraction (SPME) and solid phase extraction (SPE) techniques into a single technology platform. FPSE utilizes permeable natural/synthetic fabrics e.g., cotton, polyester, fiber glass supports to chemically bind sol-gel hybrid inorganic-inorganic sorbents. A 5 cm2unit of coated fabric (2.5 cm x 2.0 cm) is typically used as the extraction media which can be inserted directly into the sample container. Extraction of the analytes is generally expedited by using a magnetic stir bar to diffuse the analyts into the sample matrix so that rapid mass transfer from the sample matrix to the extraction medium takes place.Once the mass transfer equilibrium between the FPSE media and...
Read more

Rotating Disk Sorptive Extraction

By -
Image
by Prof. Dr. Pablo Richter, Department of Inorganic and Analytical Chemistry, Faculty of Chemical and Pharmaceutical Sciences, University of Chile. The modern trends in analytical chemistry promote efficiency and green technology in sample preparation. In this context, our research team developed a new technique in 2009 that is capable of extracting pollutants from liquid samples on a rotating PTFE disk with one surface coated with an extraction phase [1]. The disk has embedded a miniature magnetic rod, which allows rotation. We have termed this procedure rotating-disk sorptive extraction (RDSE). RDSE is currently available in two configurations. In the classic version (Figure 1), the extraction phase is a polymeric film adhered to one side of the PTFE disk (configuration 1). In this configuration, polydimethylsiloxane (PDMS), nylon and octadecyl (C18) have been used as the sorptive material for the extraction of low-polarity analytes (Log Kow between 3 and 7) [1-12]. However...
Read more