TY - JOUR
T1 - Influence of organic carbon and metal oxide phases on sorption of 2,4,6-trichlorobenzoic acid under oxic and anoxic conditions
AU - Ololade, Isaac Ayodele
AU - Oladoja, Nurudeen Abiola
AU - Alomaja, Folasade
AU - Ololade, Oluwaranti Olubunmi
AU - Olaseni, Esan O
AU - Oloye, Femi Francis
AU - Adelagun, Ruth O A
N1 - Acknowledgments
This research was funded by the Adekunle Ajasin University Akungba Akoko (Nigeria) Tertiary Education Trust Fund (TETFUND 2013/2014). Special thanks to Assistant Professor Ifedayo Victor Ogungbe of the Department of Chemistry and Biochemistry, Jackson State University, USA, for valuable contributions.
PY - 2015/1/1
Y1 - 2015/1/1
N2 - 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.
AB - 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.
KW - Adsorption
KW - Carbon
KW - Chlorobenzoates
KW - Herbicides
KW - Kinetics
KW - Metals
KW - Models, Chemical
KW - Oxidation-Reduction
KW - Oxides
KW - Soil
KW - Soil Pollutants
KW - 2,4,6-Trichlorobenzoic acid
KW - Oxic and anoxic
KW - Redox potential
U2 - 10.1007/s10661-014-4170-2
DO - 10.1007/s10661-014-4170-2
M3 - Article
C2 - 25433543
VL - 187
SP - 1
EP - 15
JO - Environmental Monitoring and Assessment
JF - Environmental Monitoring and Assessment
SN - 0167-6369
IS - 1
M1 - 4170
ER -