Phosphorus release from phosphate rock and iron phosphate by low-molecular-weight organic acids  

作　　者：XURen-kou ZHUYong-guan DavidChittleborough 

机构地区：[1]InstituteofSoilScience,ChineseAcademyofSciences,Nanjing210008,China [2]ResearchCentreforEco-EnvironmentalSciences,ChineseAcademyofSciences,Beijing100085,China [3]SoilandLandSystem,SchoolofEarthandEnvironmentalSciences,TheUniversityofAdelaide,SA5005,Australia

出　　处：《Journal of Environmental Sciences》2004年第1期5-8,共4页环境科学学报（英文版）

基　　金：The"Hundred-Talent"ProgramoftheChineseAcademyofSciences

摘　　要：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 low-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 p K _a values. P release from iron phosphate was positively correlated with Fe-organic acid stability constants except for aromatic acids, but was not correlated with p K _a. Increase in the concentrations of organic acids enhanced P solubilization from both rock and iron phosphate almost linearly. 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.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 low-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 p K _a values. P release from iron phosphate was positively correlated with Fe-organic acid stability constants except for aromatic acids, but was not correlated with p K _a. Increase in the concentrations of organic acids enhanced P solubilization from both rock and iron phosphate almost linearly. 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.

关 键 词：organic acid phosphate release RHIZOSPHERE rock phosphate iron phosphate 

分 类 号：X825[环境科学与工程—环境工程]