Iron speciation by microsequential injection solid phase spectrometry using 3-hydroxy-1(H)-2-methyl-4-pyridinone as chromogenic reagent

Ruth Suárez, Raquel B. R. Mesquita*, Maria Rangel, Víctor Cerdà, António O. S. S. Rangel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)
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Abstract

The speciation of iron using the newly synthesized 3-hydroxy-1(H)-2-methyl-4-pyridinone by solid phase spectrophotometry in a microsequential injection lab-on-valve (μSI-LOV-SPS) methodology is described. Iron was retained in a reusable column, Nitrilotriacetic Acid Superflow (NTA) resin, and the ligand was used as both chromogenic and eluting reagent. This approach, analyte retention and matrix removal, enabled the assessment of iron (III) and total iron content in fresh waters and high salinity coastal waters with direct sample introduction, in the range of 20.0-100 μg/L. with a LOD of 9 μg/L. The overall effluent production was 2 mL, corresponding to the consumption of 0.48 μg of 2-metil-3-hydroxy-4-pyridinone, 0.34 mg of NaHCO3, 16 mg of HNO3, 4.4 μg H2O2 and 400 μL of sample. Four reference samples were analyzed and a relative deviation<10% was obtained; furthermore, several bathing waters (13) were analyzed using the developed method and the results were comparable to those obtained by atomic absorption spectrophotometry (relative deviations<6%).
Original languageEnglish
Pages (from-to)15-20
Number of pages6
JournalTalanta
Volume133
DOIs
Publication statusPublished - Feb 2015

Keywords

  • 3-Hydroxy-4-pyridinone
  • Iron(III)
  • Lab-on-valve
  • NTA resin
  • Solid phase spectrometry
  • Total iron

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