Document Detail

Phosphorus release from phosphate rock and iron phosphate by low-molecular-weight organic acids.
MedLine Citation:
PMID:  14971442     Owner:  NLM     Status:  MEDLINE    
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.
Ren-kou Xu; Yong-guan Zhu; David Chittleborough
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of environmental sciences (China)     Volume:  16     ISSN:  1001-0742     ISO Abbreviation:  J Environ Sci (China)     Publication Date:  2004  
Date Detail:
Created Date:  2004-02-19     Completed Date:  2004-05-14     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  100967627     Medline TA:  J Environ Sci (China)     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  5-8     Citation Subset:  IM    
Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
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MeSH Terms
Acids / chemistry*
Geological Phenomena
Hydrogen-Ion Concentration
Iron / chemistry
Molecular Weight
Phosphorus / chemistry*
Plant Roots
Reg. No./Substance:
0/Acids; 0/Soil; 7439-89-6/Iron; 7723-14-0/Phosphorus

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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