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Phosphorus release from phosphate rock and iron phosphate by low-molecular-weight organic acids
Abstract: Low-molecular-weight(LMW) organic acids widely exist in soils, particularly in the rhizosphere. A series of batch experiments were carried out to investigate the phosphorus release from rock phosphate and iron phosphate by Iow-molecular-weight organic acids.Results showed that citric acid had the highest capacity to solubilize P from both rock and iron phosphate. P solubilization from rock phosphate and iron phosphate resulted in net proton consumption. P release from rock phosphate was positively correlated with the pKa values. P release from iron phosphate was positively correlated with Fe-organic acid stability constants except for aromatic acids, but was not correlated with PKa. Increase in the concentrations of organic acids enhanced P solubilization from both rock and iron phosphate almost linearrly. Addition of phenolic compounds further increased the P release from iron phosphate. Initial solution pH had much more substantial effect on P release from rock phosphate than from iron phosphate. 作 者: XU Ren-kou ZHU Yong-Guan David Chittleborough 作者单位: XU Ren-kou(Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China)ZHU Yong-Guan(Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China)
David Chittleborough(Soil and Land System, School of Earth and Environmental Sciences, The University of Adelaide, SA 5005, Australia)
期 刊: 环境科学学报(英文版) ISTICSCI Journal: JOURNAL OF ENVIRONMENTAL SCIENCES 年,卷(期): 2004, 16(1) 分类号: X131.3 Keywords: organic acid phosphate release rhizosphere rock phosphate iron phosphate【Phosphorus release from phosphate ro】相关文章:
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