Magnetic iron-cobalt/silica nanocomposite as adsorbent in micro solid-phase extraction for preconcentration of arsenic in environmental samples

Cuma Magoda, Philiswa N. Nomngongo, Nonhlangabezo Mabuba

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

A new method for separation/preconcentration of trace As in environmental samples by micro solid-phase extraction (μ-SPE) using CoFe2O4@SiO2 magnetic nanoparticles (MNPs) prior to ICP-OES determination, has been developed. The morphological characteristic of the magnetic nanomaterial was characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDS), and X-ray diffractometer (XRD). Optimal experimental conditions including pH, adsorbent mass, and eluent acid concentration were found to be 3, 100 mg and 5 mol L-1 HCl, respectively. The adsorption capacity of the MNPs of As was found to be 8.5 mg g-1. Under optimum conditions, the analytical limits of detection (LOD) and limits of quantification (LOQ) were found to be 2.8 and 9.2 μg L-1, respectively. The accuracy of the method was tested by analyzing certified wastewater (CWW-TM-D) and the recoveries were found to be greater than 90%. The method was successfully applied to the determination of trace amounts of As in river and tap water samples.

Original languageEnglish
Pages (from-to)242-247
Number of pages6
JournalMicrochemical Journal
Volume128
DOIs
Publication statusPublished - 1 Sept 2016

Keywords

  • Arsenic
  • ICP-OES
  • Magnetic nanoparticles
  • Preconcentration
  • Tap and river water

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

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