Ligandless temperature-controlled ionic liquid-phase microextraction of lead(II) ion prior to its determination by FAAS

Alothman Z. A., YILMAZ E., Habila M., Shabaka A., SOYLAK M.

MICROCHIMICA ACTA, vol.180, pp.669-674, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 180
  • Publication Date: 2013
  • Doi Number: 10.1007/s00604-013-0979-6
  • Journal Name: MICROCHIMICA ACTA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.669-674
  • Keywords: Ligandless, Microextraction, Ionic liquids, Preconcentration, Lead, FLAME ATOMIC-ABSORPTION, MULTIWALLED CARBON NANOTUBES, SINGLE-DROP MICROEXTRACTION, TRACE-METAL IONS, WATER SAMPLES, SPECTROMETRIC DETERMINATION, ENVIRONMENTAL-SAMPLES, SORBENT EXTRACTION, BIOLOGICAL SAMPLES, ACTIVATED CARBON
  • Erciyes University Affiliated: Yes

Abstract

We describe the application of temperature-controlled ionic liquid based microextraction (TC-IL-ME) of lead(II) ion. The method does not require the use of an organic solvent or a ligand. Rather, the IL is directly added to the aqueous sample containing Pb(II) in a centrifuge tube, and the mixture is heated to 80 A degrees C for 4 min. After cooling at 0 A degrees C, the solution turns cludy due to the formation of fine droplets of the IL containing Pb(II). The IL is separated by centrifugation, acidified, and directly submitted to FAAS by microinjection. The effects of pH value, volume of IL, extraction time, temperature, sample volume and matrix were optimized to result in a preconcentration factor of 30, a detection limit of 5.8 mu g L-1, and a limit of quantification of 19.3 mu g L-1. The method was validated by analyzing a certified reference material (NCSZC81002B; hair). A recovery test performed with spiked samples gave values between 102 % and 105 %. The method was also used to determine Pb(II) in hair samples.