Arsenic biogeochemistry as affected by phosphorus fertilizer addition,redox potential and pH in a west Bengal (India) soil |
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| Affiliation: | 1. MOE Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China;2. Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA 91125, USA;1. University of Wuppertal, Soil- and Groundwater-Management, Pauluskirchstraße 7, 42285 Wuppertal, Germany;2. University of Kafrelsheikh, Faculty of Agriculture, Department of Soil and Water Sciences, 33 516 Kafr El-Sheikh, Egypt;3. Troy University, Department of Biological and Environmental Sciences, Troy, 36082, AL, USA;1. College of Chemistry & Chemical Engineering, Central South University, Changsha 410083, China;2. Center for Environment and Water Resources, Central South University, Changsha 410083, China;1. Centre for Environmental Risk Assessment and Remediation (CERAR), University of South Australia, Mawson Lakes Campus, Mawson Lakes, SA 5095, Australia;2. Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC-CARE), P O Box 486, Salisbury South, SA 5106, Australia;3. School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India;4. Global Centre for Environmental Remediation (GCER), Faculty of Science and Information Technology, The University of Newcastle, University Drive, Callaghan, NSW 2308, Australia |
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| Abstract: | This laboratory experiment systematically examines arsenic, iron, and phosphorus solubilities in soil suspensions as affected by addition of phosphorus fertilizer under different redox potential (Eh) and pH conditions. Under aerobic conditions, As solubility was low, however, under moderately reducing conditions (0, − 150 mV), As solubility significantly increased due to dissolution of iron oxy-hydroxides. Upon reduction to − 250 mV, As solubility was controlled by the formation of insoluble sulfides, and as a result soluble As contents significantly decreased. Soluble Fe concentration increased from moderate to highly anaerobic conditions; however, it decreased under aerobic conditions likely due to formation of insoluble oxy-hydroxides. A low pH, 5.5, led to increased soluble concentrations of As, Fe, and P. Finally, addition of P-fertilizers resulted in higher soluble P and As, even though the concentration of As did not increased after an addition rate of 600 mg P kg− 1 soil. |
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