Journal of Applied Spectroscopy

, Volume 83, Issue 3, pp 422–428 | Cite as

Halloysite Nanotubes as a New Adsorbent for Solid Phase Extraction and Spectrophotometric Determination of Iron in Water and Food Samples

  • A. SamadiEmail author
  • M. Amjadi

Halloysite nanotubes (HNTs) have been introduced as a new solid phase extraction adsorbent for preconcentration of iron(II) as a complex with 2,2-bipyridine. The cationic complex is effectively adsorbed on the sorbent in the pH range of 3.5–6.0 and efficiently desorbed by trichloroacetic acid. The eluted complex has a strong absorption around 520 nm, which was used for determination of Fe(II). After optimizing extraction conditions, the linear range of the calibration graph was 5.0–500 μg/L with a detection limit of 1.3 μg/L. The proposed method was successfully applied for the determination of trace iron in various water and food samples, and the accuracy was assessed through the recovery experiments and analysis of a certified reference material (NIST 1643e).


halloysite nanotubes solid phase extraction iron spectrophotometry 


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© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.University of TabrizTabrizIran

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