Simultaneous preconcentration and speciation of iron(II) and iron(III) in water samples by 2-mercaptobenzimidazole-silica gel sorbent and flow injection analysis system

Bagheri, H ; Sharif University of Technology | 2000

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  1. Type of Document: Article
  2. DOI: 10.1016/S0003-2670(00)01151-X
  3. Publisher: 2000
  4. Abstract:
  5. 2-Mercaptobenzimidazole, loaded on silica gel (MBI-SG) was used for preconcentration and speciation of iron(II) and iron(III) in water samples. The speciation is based upon selective retention of iron(III) on MBI-SG sorbent and quantitatively passing iron(II) ions. This type of sorbent was not only capable of separating theses two ions but also could concentrate them. The adsorbed iron(III) on MBI-SG was desorbed from the column by an SCN- solution and transferred to the detection device. The effluent, then, was treated with hydrogen peroxide to oxidize iron(II) into iron(III) and subsequently was pumped through the MBI-SG column. A home-made flow injection system was coupled with a UV-VIS and an atomic absorption spectrometer, simultaneously. This method was applied to four different water samples and sub-ppb detection limit, high accuracy (>99% recovery), good precision (R.S.D. < 5%), and good potential for automation were observed. (C) 2000 Elsevier Science B.V
  6. Keywords:
  7. 2-Mercaptobenzimidazole ; Silica gel ; Simultaneous preconcentration
  8. Source: Analytica Chimica Acta ; Volume 424, Issue 2 , 2000 , Pages 233-242 ; 00032670 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S000326700001151X