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Underestimation of phosphorus fraction change in the supernatant after phosphorus adsorption onto iron oxides and iron oxide-natural organic matter complexes

文献类型： 外文期刊

作者： Yan, Jinlong 1 ; Jiang, Tao 2 ; Yao, Ying 3 ; Wang, Jun 1 ; Cai, Yuanli 4 ; Green, Nelson W. 5 ; Wei, Shiqiang 1 ;

作者机构： 1.Southwest Univ, Dept Environm Sci & Engn, Coll Resources & Environm, Chongqing Key Lab Agr Resources & Environm, Chongqing 400716, Peoples R China

2.Swedish Univ Agr Sci, Dept Forest Ecol & Management, SE-90183 Umea, Sweden

3.Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China

4.Mianyang Normal Univ, Coll Chem & Chem Engn, Mianyang 621000, Peoples R China

5.Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA

关键词： Phosphorus;Fraction;Ultrafiltration;Natural organic matter;Iron-DOM;Iron oxide-humic acid complexes

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：5.9； 五年影响因子：5.6 ）

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收录情况： SCI

摘要： The phosphorus (P) fraction distribution and formation mechanism in the supematant after P adsorption onto iron oxides and iron oxide-humic acid (HA) complexes were analyzed using the ultrafiltration method in this study. With an initial P concentration of 20 mg/L (I = 0.01 mol/L and pH = 7), it was shown that the colloid (1 kDa-0.45 gm) component of P accounted for 10.6%, 11.6%, 6.5%, and 4.0% of remaining total P concentration in the supematant after P adsorption onto ferrihydrite (FH), goethite (GE), ferrihydrite-humic acid complex (FH-HA), goethite-humic acid complex (GE-HA), respectively. The <1 kDa component of P was still the predominant fraction in the supematant, and underestimated colloidal P accounted for 2.2%, 55.1%, 45.5%, and 38.7% of P adsorption onto the solid surface of FH, FH-HA, GE and GE-HA, respectively. Thus, the colloid P could not be neglected. Notably, it could be interpreted that Fe3+ hydrolysis from the adsorbents followed by the formation of colloidal hydrous ferric oxide aggregates was the main mechanism for the formation of the colloid P in the supematant. And colloidal adsorbent particles co-existing in the supernatant were another important reason for it. Additionally, dissolve organic matter dissolved from iron oxide-HA complexes could occupy large adsorption sites of colloidal iron causing less colloid P in the supematant. Ultimately, we believe that the findings can provide a new way to deeply interpret the geochemical cycling of P, even when considering other contaminants such as organic pollutants, heavy metal ions, and arsenate at the sediment/soil-water interface in the real environment. (C) 2016 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

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