Influence of organic carbon and metal oxide phases on sorption of 2,4,6-trichlorobenzoic acid under oxic and anoxic conditions

Isaac Ayodele Ololade, Nurudeen Abiola Oladoja, Folasade Alomaja, Oluwaranti Olubunmi Ololade, Esan O Olaseni, Femi Francis Oloye, Ruth O A Adelagun

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Abstract

Chlorobenzoic acids represent crucial recalcitrant metabolites in the environment; thus, the influence of soil components on the sorption of 2,4,6-trichlorobenzoic acid (TCB) under oxic and anoxic conditions was studied. The surficial physiognomies of untreated and isolated soil samples were studied using FTIR, XRD, specific surface area, and PZC determination. The roles of redox potential, dissolved organic carbon (DOC), and pH, particularly under anoxic condition, were appraised. Batch equilibrium adsorption studies on soils of variable Fe/Mn oxides and organic carbon showed that adsorption was low across all components (log Koc = 0.82-3.10 Lg(-1)). The sorption of 2,4,6-TCB was well described by the pseudo second-order kinetic model. The fluctuation of both redox potential and pH during anoxic experiment had a negative impact on the sorption, partitioning, and the oxidation of organic matter. Linear relationships were observed for Kd with both soil total organic carbon (TOC) and surface area (SA). The results showed the existence of DOC-mediated sorption of 2,4,6-TCB which seems to be enhanced at lower pH. The reductive dissolution, particularly of iron compounds, possibly impeded sorption of 2,4,6-TCB under anoxic condition. It could be inferred that habitats dominated by fluctuating oxygen concentrations are best suited for the development of environmental conditions capable of mineralizing 2,4,6-TCB and similar xenobiotics.

Original languageEnglish
Article number4170
Pages (from-to)1-15
Number of pages15
JournalEnvironmental Monitoring and Assessment
Volume187
Issue number1
Early online date1 Dec 2014
DOIs
Publication statusPublished - 1 Jan 2015

Keywords

  • Adsorption
  • Carbon
  • Chlorobenzoates
  • Herbicides
  • Kinetics
  • Metals
  • Models, Chemical
  • Oxidation-Reduction
  • Oxides
  • Soil
  • Soil Pollutants
  • 2,4,6-Trichlorobenzoic acid
  • Oxic and anoxic
  • Redox potential

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    Ololade, I. A., Oladoja, N. A., Alomaja, F., Ololade, O. O., Olaseni, E. O., Oloye, F. F., & Adelagun, R. O. A. (2015). Influence of organic carbon and metal oxide phases on sorption of 2,4,6-trichlorobenzoic acid under oxic and anoxic conditions. Environmental Monitoring and Assessment, 187(1), 1-15. [4170]. https://doi.org/10.1007/s10661-014-4170-2