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Hollow-Fibre Liquid-Phase Microextraction for the Determination of Polycyclic Aromatic Hydrocarbons in Johannesburg Jukskei River, South Africa

In English

Författare

Summary, in English

A simple, rapid and environmentally friendly hollow-fibre liquid-phase microextraction (HF-LPME) technique was developed for the quantitative determination of polycyclic aromatic hydrocarbons (PAHs) in aqueous samples. GC-MS was then used as the method of analysis. The HF-LPME technique involves extraction of PAHs from a 20-mL sample containing 20 % acetonitrile as a modifier. The PAHs were extracted into a 5-cm hollow fibre filled with heptane as organic solvent. At a stirring speed and extraction time of 600 rpm and 30 min, respectively, the acceptor solvent was then collected to be analysed. Parameters that affect the extraction efficiency were optimised in order to achieve high enrichment of the analytes. In order to evaluate the practical applicability of the HF-LPME technique, the performance of the method was compared to solid-phase extraction using spiked deionised water and real water samples. The obtained concentration enrichment factors ranged from 48 to 95 for HF-LPME and 81-135 for SPE, depending on the individual PAH. The detection limit ranged from 23 to 95 ng L-1 for HF-LPME and 20-52 ng L-1 for SPE. Water samples from the Johannesburg area, South Africa, were analysed using both extraction methods and the results were in good agreement. The relative standard deviations were less than 12 % for both methods. In this comparison, SPE was found to give high concentration enrichment factors and recovery, whereas faster and cheaper analyses were achieved with HF-LPME. The concentration of PAHs found could be arranged in the following order: phenanthrene > acenaphthene > fluoranthene > naphthalene > pyrene.

Publiceringsår

2013

Språk

Engelska

Sidor

427-436

Publikation/Tidskrift/Serie

Chromatographia

Volym

76

Issue

7-8

Dokumenttyp

Artikel i tidskrift

Förlag

Vieweg Verlag

Ämne

  • Chemical Sciences

Nyckelord

  • GC-MS
  • HF-LPME
  • SPE
  • Comparison
  • PAHs
  • Aqueous samples

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0009-5893