Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/34263
Type: Journal article
Title: Phosphorus release from phosphate rock and iron phosphate by low-molecular-weight organic acids
Author: Xu, R.
Zhu, Y.
Chittleborough, D.
Citation: Journal of Environmental Sciences, 2004; 16(1):5-8
Publisher: I O S Press
Issue Date: 2004
ISSN: 1001-0742
1878-7320
Statement of
Responsibility: 
Xu, Ren-kou; Zhu, Yong-guan; Chittleborough, David
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 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 pKa values. P release from iron phosphate was positively correlated with Fe-organic acid stability constants except for aromatic acids, but was notcorrelated with pKa. 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.
Keywords: Plant Roots; Acids; Iron; Phosphorus; Soil; Hydrogen-Ion Concentration; Molecular Weight; Geology; Geological Phenomena
RMID: 0020064556
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute publications

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