Loading...

A core–shell titanium dioxide polyaniline nanocomposite for the needle-trap extraction of volatile organic compounds in urine samples

Banihashemi, S ; Sharif University of Technology | 2017

2071 Viewed
  1. Type of Document: Article
  2. DOI: 10.1002/jssc.201600970
  3. Publisher: Wiley-VCH Verlag , 2017
  4. Abstract:
  5. We synthesized a titanium dioxide–polyaniline core–shell nanocomposite and implemented it as an efficient sorbent for the needle-trap extraction of some volatile organic compounds from urine samples. Polyaniline was synthesized, in the form of the emeraldine base, dissolved in dimethyl acetamide followed by diluting with water at pH 2.8, using the interfacial polymerization method. The TiO2 nanoparticles were encapsulated inside the conducting polymer shell, by adapting the in situ dispersing approach. The surface characteristics of the nanocomposite were investigated by Fourier transform infrared spectrometry, scanning electron microscopy, and transmission electron microscopy. After obtaining acceptable preliminary results, some selected volatile compounds, including chloroform, benzene, toluene, ethylbenzene, xylene, and chlorobenzenes were used as model analytes to validate the enrichment properties of the prepared sorbent in conjunction with gas chromatography mass spectrometric detection. Important parameters influencing the extraction process such as extraction temperature, ionic strength, sampling flow rate, extraction time, desorption temperature, and time were optimized. The limits of detection and limits of quantification values were in the range of 0.5–3 and 2–5 ng/L, respectively, using time-scheduled selected ion monitoring mode. The relative standard deviation percent with three replicates was in the range of 5–10%. The applicability of the developed needle-trap method was examined by analyzing urine samples and the relative recovery percentages for the spiked samples were in the range of 81–105%. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
  6. Keywords:
  7. Gas chromatography with mass spectrometry ; Needle-trap extraction ; Polyaniline ; Titanium dioxide nanoparticles ; Volatile organic compounds ; Body fluids ; Chemical analysis ; Chromatography ; Conducting polymers ; Core samples ; Electron microscopy ; Fourier transform infrared spectroscopy ; Gas chromatography ; High resolution transmission electron microscopy ; Importance sampling ; Ionic strength ; Mass spectrometry ; Nanocomposites ; Nanoparticles ; Needles ; Organic compounds ; Oxides ; Shells (structures) ; Spectrometry ; Titanium ; Titanium dioxide ; Transmission electron microscopy ; Core-shell nanocomposites ; Fourier transform infrared spectrometry ; Interfacial polymerization ; Mass spectrometric detection ; Needle traps ; Polyaniline nanocomposites ; Relative standard deviations ; Benzene ; Chlorobenzene ; Chloroform ; Ethylbenzene ; Meta xylene ; Nanocomposite ; Ortho xylene ; Titanium dioxide nanoparticle ; Toluene ; Volatile organic compound ; Article ; Desorption ; Flow rate ; High performance liquid chromatography ; Infrared spectroscopy ; Ion monitoring ; Limit of detection ; Limit of quantitation ; Nanoencapsulation ; Needle trap extraction ; pH ; Priority journal ; Process optimization ; Scanning electron microscopy ; Satic electricity ; Synthesis ; Temperature ; Time ; Urine sampling ; Vibration ; Zeta potential
  8. Source: Journal of Separation Science ; Volume 40, Issue 9 , 2017 , Pages 1985-1992 ; 16159306 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/10.1002/jssc.201600970