Solid-phase extraction, quantification, and selective determination of microcystins in water with a gold-polypyrrole nanocomposite sorbent material.

Autor: Devasurendra AM; Department of Chemistry and Biochemistry, College of Natural Sciences and Mathematics, University of Toledo, Toledo, OH, 43606, United States; School of Green Chemistry and Engineering, University of Toledo, Toledo, OH, 43606, United States., Palagama DSW; Department of Chemistry and Biochemistry, College of Natural Sciences and Mathematics, University of Toledo, Toledo, OH, 43606, United States; School of Green Chemistry and Engineering, University of Toledo, Toledo, OH, 43606, United States., Rohanifar A; Department of Chemistry and Biochemistry, College of Natural Sciences and Mathematics, University of Toledo, Toledo, OH, 43606, United States; School of Green Chemistry and Engineering, University of Toledo, Toledo, OH, 43606, United States., Isailovic D; Department of Chemistry and Biochemistry, College of Natural Sciences and Mathematics, University of Toledo, Toledo, OH, 43606, United States; School of Green Chemistry and Engineering, University of Toledo, Toledo, OH, 43606, United States. Electronic address: Dragan.Isailovic@utoledo.edu., Kirchhoff JR; Department of Chemistry and Biochemistry, College of Natural Sciences and Mathematics, University of Toledo, Toledo, OH, 43606, United States; School of Green Chemistry and Engineering, University of Toledo, Toledo, OH, 43606, United States. Electronic address: Jon.Kirchhoff@utoledo.edu., Anderson JL; Department of Chemistry, Iowa State University, Ames, IA, 50011, United States.
Jazyk: angličtina
Zdroj: Journal of chromatography. A [J Chromatogr A] 2018 Jul 27; Vol. 1560, pp. 1-9. Date of Electronic Publication: 2018 Apr 13.
DOI: 10.1016/j.chroma.2018.04.027
Abstrakt: A novel sorbent material, gold-polypyrrole (Au-PPy) nanocomposite-coated silica, is described for the efficient solid-phase extraction (SPE) of six common microcystins (MCs) well below the recommended United States EPA and World Health Organization (WHO) guidelines. With the optimized SPE protocol, samples spiked with MCs were determined at ng/L concentrations by liquid chromatography-mass spectrometry (LC-MS) in different aqueous sample matrices, including HPLC-grade, tap, and lake water. The average recoveries for all MCs tested in the three water matrices ranged from 94.1-103.2% with relative standard deviations (RSDs) of 1.6-5.4%, which indicated excellent extraction efficiency and reproducibility. Limits of detection (LODs) and limits of quantification (LOQs) for all MCs in both tap and lake water samples were determined to be ≤1.5 ng/L and 5.0 ng/L, respectively. The Au-PPy nanocomposite-coated sorbent material was reusable for at least three independent MC extractions with a single SPE cartridge in the concentration range of 10-500 ng/L. Importantly, off-column selective separation at the sample preparation and preconcentration stage between more hydrophilic and more hydrophobic MCs was achieved by sequential elution through changes in the solvent composition and SPE bed size. Therefore, the Au-PPy nanocomposite-coated silica sorbent is a promising new material for the quantification of MC variants in water samples.
(Copyright © 2018 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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