Effects of Dissolved Organic Carbon on Phosphate Retention on Two Calcareous Soils
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- 作者：Manuel Ferná ; ndez-Pé ; rez ; Francisco Flores-Cé ; spedes ; Emilio Gonzá ; lez-Pradas ; Marí ; a Delores Ureñ ; a-Amate ; Matilde Villafranca-Sá ; nchez ; Marí ; a Soc&iac
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2005
- 出版时间：January 12, 2005
- 年：2005
- 卷：53
- 期：1
- 页码：84 - 89
- 全文大小：134K
- 年卷期：v.53,no.1(January 12, 2005)
- ISSN：1520-5118
文摘
To evaluate the effects of dissolved organic carbon (DOC) on phosphate retention (including bothsorption and/or precipitation reactions) on soils, experiments were performed by using two typicalcalcareous soils from southeastern Spain (Calcic Regosol and Luvic Xerosol) and two different typesof DOC: (1) extracts from a commercial peat (DOC-PE) and (2) high-purity tannic acid (DOC-TA).The experiments were carried out from a 0.01 M CaCl2 aqueous medium at 25 
C. The results obtainedshow that the presence of both DOC-PE and DOC-TA, over a concentration range of 15 (DOC-15)to 100 (DOC-100) mg L-1, produces in all cases a decreasing amount of phosphate retained in thesoils studied, the decrease observed being higher when DOC-PE is used as source of DOC. Thevalues of the decrease observed when DOC-PE was added ranged between 19.9% (DOC-15) and15.6% (DOC-100) for the Calcic Regosol and between 17.3% (DOC-70, DOC-100) and 14.6%(DOC-15) for the Luvic Xerosol. The variation observed when DOC-TA was added ranged between8.5% (DOC-100) and 0.5% (DOC-35) for the Calcic Regosol and between 7.0% (DOC-100) and1.0% (DOC-15) for the Luvic Xerosol.Keywords: Phosphate; sorption; precipitation; calcareous soil; dissolved organic carbon
C. The results obtainedshow that the presence of both DOC-PE and DOC-TA, over a concentration range of 15 (DOC-15)to 100 (DOC-100) mg L-1, produces in all cases a decreasing amount of phosphate retained in thesoils studied, the decrease observed being higher when DOC-PE is used as source of DOC. Thevalues of the decrease observed when DOC-PE was added ranged between 19.9% (DOC-15) and15.6% (DOC-100) for the Calcic Regosol and between 17.3% (DOC-70, DOC-100) and 14.6%(DOC-15) for the Luvic Xerosol. The variation observed when DOC-TA was added ranged between8.5% (DOC-100) and 0.5% (DOC-35) for the Calcic Regosol and between 7.0% (DOC-100) and1.0% (DOC-15) for the Luvic Xerosol.Keywords: Phosphate; sorption; precipitation; calcareous soil; dissolved organic carbon