title: Distribution and interactions of pentachlorophenol in soils: The roles of soil iron oxides and organic matter.
abstract: Soil iron oxides (IOs) and organic matter (OM) play varying roles in pentachlorophenol (PCP) retention and mobility, but the extent and mechanism are still unknown. Therefore, in order to have a better understanding of the adsorption of PCP on soils, batch sorption studies were carried out on whole soils and soils selectively treated to remove IOs (IOR) and OM (OMR). The effects of pH, time, and temperature were investigated. Results showed that PCP sorption was temperature and pH dependent; sorption decreased as both temperature and pH increased. Sorption was partly surface adsorption and partly partitioning within voids of IOs components as revealed by the kinetics models. The surface adsorption was multi-layer in nature. Equilibria were faster in the IOR soils than the untreated and OMR soils. IOs played greater roles in PCP sorption than OM. Removal of soil components, especially the IOs, as experienced in soils plagued by soil erosion, may lead to increased risks of PCP pollution of environmental media especially the aquifer.
authors.affiliation: Department of Physical Sciences, Landmark University, Kwara State, Nigeria. Electronic address: pauldn2@yahoo.com.
authors.forename: Paul N
authors.initials: PN
authors.lastname: Diagboya
authors.affiliation: Department of Chemistry, University of Ibadan, Ibadan, Nigeria.
authors.forename: Bamidele I
authors.initials: BI
authors.lastname: Olu-Owolabi
authors.affiliation: Department of Chemistry, University of Ibadan, Ibadan, Nigeria.
authors.forename: Kayode O
authors.initials: KO
authors.lastname: Adebowale
mesh_terms: D000327:Adsorption; D005290:Ferric Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D009549:Nigeria; D010416:Pentachlorophenol / Q000737:chemistry*; D012987:Soil; D012989:Soil Pollutants / Q000737:chemistry*; D013696:Temperature
chemical_list: D005290:Ferric Compounds; D012987:Soil; D012989:Soil Pollutants; C000499:ferric oxide; D010416:Pentachlorophenol
keywords: Anionic pesticide; Soil iron oxides removal; Soil organic matter removal; Sorption; Sub-Saharan soils