Competitive interaction between soil-derived humic acid and phosphate on goethite |
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| Institution: | 1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;2. State Environmental Protection Key Laboratory for Lake Pollution Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;3. College of Geographical Science, Nanjing Normal University, Jiangsu Key Laboratory of Environmental Change and Ecological Construction, Nanjing, China;4. Department of Veterinary Biomedical Sciences and Toxicology Centre, University of Saskatchewan, Saskatoon, Saskatchewan, Canada;5. Zoology Department and Center for Integrative Toxicology, Michigan State University, East Lansing, MI 48824, USA;1. Department of Chemical Engineering, ProcESS – Process Engineering for Sustainable Systems, KU Leuven, W. de Croylaan 46, B-3001 Leuven, Belgium;2. Faculty of Chemical and Food Technology, HCM University of Technical Education, Viet Nam;3. Separation and Conversion Technology, Flemish Institute for Technological Research (VITO), Boeretang 200, B-2400 Mol, Belgium;4. School of Bioprocess Engineering, Universiti Malaysia Perlis, Kompleks Pusat Pengajian Jejawi 3, 02600 Arau, Perlis, Malaysia;5. Department of Microbial and Molecular Systems, Cluster for Bioengineering Technology, KU Leuven @ KULAB, Zeedijk 101, B-8400 Oostende, Belgium;6. Department of Chemical Engineering, Cluster Sustainable Chemical Process Technology, KU Leuven @ KAHO St.-Lieven, Gebroeders Desmetstraat 1, B-9000 Gent, Belgium;1. Plant & Soil Sciences Department, University of Delaware, Newark, DE 19716-000, United States;2. Soil Science Department, Federal University of Viçosa, Viçosa, MG 36570-000, Brazil;1. Institute of Water Chemistry, Technische Universität Dresden, D-01062 Dresden, Germany;2. VKTA Nuclear Engineering and Analytics Inc., P.O. Box 510119, D-01314 Dresden, Germany;1. School of Ecology and Environment, Inner Mongolia University, Huhhot 010021, China;2. Institute of Environmental Geology, Inner Mongolia University, Huhhot 010021, China;3. Tianjin Academy of Environmental Sciences, Tianjin, 300191, China |
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| Abstract: | In order to better understand the influence and mechanism of soil-derived humic acid (SHA) on adsorption of P onto particles in soils, the amounts of PO4 adsorbed by synthetic goethite (α-FeOOH) were determined at different concentrations of SHA, pH, ionic strength and order of addition of adsorbents. Addition of SHA can significantly reduce the amount of PO4 adsorption as much as 27.8%. Both generated electrostatic field and competition for adsorption sites were responsible for the mechanism by which SHA inhibited adsorption of PO4 by goethite. This conclusion was supported by measurement of total organic C (TOC), infrared spectral features and Zeta potential. Adsorption of PO4 onto goethite was inversely proportional to pH. Order of addition of PO4 and SHA can influence adsorption of PO4 as follows: prior addition of PO4 ? simultaneous addition > prior addition of SHA. Iron and SHA apparently form complexes due to prior addition of SHA. Observations made during this study emphasized that PO4 forms different types of complexes on the surface of goethite at different pH, which dominated the interaction of SHA and PO4 adsorption on goethite. Based on these observations, the possible modes of SHA inhibition of PO4 adsorption on goethite were proposed. |
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