Integrated flow-based system displaying an in-line mini soil column to monitor iron species in soils leachates

Letícia S. Mesquita, Raquel B. R. Mesquita*, Andreia Leite, Tânia Moniz, Maria Rangel, António O. S. S. Rangel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Contamination of ground water as a consequence of soil leaching processes is an issue of major concern. In this context, a simulation of the soil leaching process was designed. A sequential injection (SI) method to monitor the soil leaching of iron complexes with in-line rain simulation for leachate production is described. The developed methodology comprises the SI determination of both iron(III) and 3-hydroxy-4-pyridinones iron(III) complexes, coupled to a mini soil column (mSC) for displaying in-line rain simulations. The described SI method enabled iron(III) determination within the range 2.0–35 µmol L−1, with a detection limit of 0.42 µmol L−1, and determination of iron(III) complexes in the range 1.0–45 µmol L−1. It was successfully applied to leachates from laboratory scale soil columns (LSSC), with good precision for both iron(III) and iron complexes determinations: calculated relative standard deviation (RSD) of 5% and 6%, respectively. A step further in automation and miniaturization was attained with the incorporation of a mini soil column for the in-line leachate production. The system enabled the soil leachate production and assessment in less than 5 min, including determinations in triplicate.
Original languageEnglish
Pages (from-to)1089-1100
Number of pages12
JournalCommunications in Soil Science and Plant Analysis
Issue number8
Publication statusPublished - 27 Apr 2020


  • In-line rain simulation
  • Iron and iron complexes
  • Mini soil column
  • Sequential injection
  • Soil leachate


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