Ultrasound assisted-ionic liquid-dispersive liquid-liquid microextraction for preconcentration of inorganic tellurium in environmental water samples prior to inductively coupled plasma – Optical emission spectrometry detection

Luthando Nyaba, N. Raphael Biata, J. Catherine Ngila, Philiswa N. Nomngongo

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

In this study, a rapid, simple, selective and highly efficient ultrasound assisted-ionic liquid-dispersive liquid-liquid microextraction (UA-IL-DLLME) for preconcentration of tellurium in environmental water samples has been developed. The concentration of Te after microextraction was quantified using inductively coupled plasma optical emission spectrometry (ICP-OES). Experimental parameters that enhances in the performance of the microextraction process were optimized using a multivariate strategy. Under optimized conditions the enrichment factor, limits of detection (LOD) and limits of quantification (LOQ) were 850, 0.42 ng L− 1 and 1.4 ng L− 1, respectively. The intra-day (n = 11) and inter-day (n = 5) precisions expressed in terms of relative standard deviations (RSD) were found to be 2.3% and 4.5%, respectively. The accuracy of the developed method was tested by analyzing a standard reference material (SRM 1643e, trace elements in water), a drinking water certified reference material (CRM-TMDW) and spiked real water samples. The obtained values were in good agreement with the certified or added values and the recoveries were > 95%. In addition, the UA-IL-DLLME/ICP-OES method was applied for the determination of Te in different water samples.

Original languageEnglish
Pages (from-to)154-159
Number of pages6
JournalJournal of Molecular Liquids
Volume231
DOIs
Publication statusPublished - 1 Apr 2017

Keywords

  • Aliquat 336
  • Ionic liquid
  • Speciation
  • Surface
  • Tap water
  • Tellurium
  • Ultrasound-assisted DLLME

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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