title: Spatial and temporal variations in pentachlorophenol dissipation at the aerobic--anaerobic interfaces of flooded paddy soils.
abstract: Pentachlorophenol (PCP) dissipation occurs naturally in flooded soils and although dissipation half-lives vary between soil profiles at the millimeter-scale the reason is poorly understood. Vertical variations of PCP dissipation were investigated in three typical Chinese paddy soils; Soil 1 (Umbraqualf), Soil 2 (Plinthudult) and Soil 3 (Tropudult). The soil depth was divided into a surface and a deep layer based upon different PCP dissipations in the surface layer of 40-93, 42-88 and 16-100% for Soils 1-3 respectively. In the deep layer, PCP was greatly dissipated in Soil 2, but much less in Soil 1 and Soil 3. Correlation analysis indicated that SO4(2-) and Fe(III) were negatively related to PCP dissipation. SO4(2-) and Cl(-) were highly mobile in the flooded soil profiles. Fe(III) reduction increased with increasing soil depth, and was inhibited by high SO4(2-) concentrations.
authors.affiliation: College of Environmental and Natural Resource Sciences, Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Zhejiang University, Hangzhou 310058, China.
authors.forename: Jiajiang
authors.initials: J
authors.lastname: Lin
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu
authors.forename: Philip C
authors.initials: PC
authors.lastname: Brookes
authors.forename: Yan
authors.initials: Y
authors.lastname: He
authors.forename: Jianming
authors.initials: J
authors.lastname: Xu
mesh_terms: D000332:Aerobiosis; D000383:Agriculture; D000693:Anaerobiosis; D004784:Environmental Monitoring; D055868:Floods; D005618:Fresh Water / Q000737:chemistry; D006540:Herbicides / Q000032:analysis; D007306:Insecticides / Q000032:analysis; D012275:Oryza; D010416:Pentachlorophenol / Q000032:analysis*; D018570:Risk Assessment; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis*; D062211:Spatio-Temporal Analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D006540:Herbicides; D007306:Insecticides; D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D010416:Pentachlorophenol