%0 Journal Article
%T Phosphorus release from phosphate rock and iron phosphate by low-molecular-weight organic acids
%A XU Ren-kou
%A ZHU Yong-Guan
%A David Chittleborough
%A <br>XU Ren-kou
%A ZHU Yong-guan
%A David Chittleborough
%J 环境科学学报(英文版)
%D 2004
%I 
%X 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.
%K organic acid
%K phosphate release
%K rhizosphere
%K rock phosphate
%K iron phosphate<br>低分子有机酸
%K 磷酸铁
%K 铁矿石
%K 土壤分析
%K 磷
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=6CB1530875F53489BF1E81BD87B7F5E6&aid=37784835CFC4AD11D8429B43A88B4037&yid=D0E58B75BFD8E51C&vid=7801E6FC5AE9020C&iid=CA4FD0336C81A37A&sid=94C357A881DFC066&eid=5D311CA918CA9A03&journal_id=1001-0742&journal_name=Journalofenvironmentalsciences(China)&referenced_num=1&reference_num=21