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

被引:9
作者
David Chittleborough
机构
[1] Australia
[2] School of Earth and Environmental Sciences
[3] Soil and Land System
[4] The University of Adelaide SA 5005
关键词
organic acid; phosphate release; rhizosphere; rock phosphate; iron phosphate;
D O I
暂无
中图分类号
X53 [土壤污染及其防治];
学科分类号
082803 ; 120405 ;
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.
引用
收藏
页码:5 / 8
页数:4
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