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Coupled Effects of Sedimentary Iron Oxides and Organic Matter on Geogenic Phosphorus Mobilization in Alluvial-lacustrine Aquifers by Xinxin Zhang; Xianzhong Ke; Yao Du; Yanqiu Tao; Jiangkai Xue; Qinghua Li; Xianjun Xie; Yamin Deng is a Environmental Science article available to read on EtoBox.

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The organic matter (OM) biodegradation and reductive dissolution of iron oxides have been acknowledged as key factors in the release of geogenic phosphorus (P) to groundwater. However, the coupled effects of natural OM with iron oxides on the mobilization of geogenic P remain unclear. Groundwater with high and low P concentrations has been observed in two boreholes in the alluvial-lacustrine aquifer system of the Central Yangtze River Basin. Sediment samples from these boreholes were examined for their P and Fe species as well as their OM properties. The results show that sediments from borehole S1 with high P levels contain more bioavailable P, particularly iron oxide bound P (Fe-P) and organic P (OP) than those from borehole S2 with low P levels. Regarding borehole S2, Fe-P and OP show positive correlations with total organic carbon as well as amorphous iron oxides (FeOX1), which indicate the presence of Fe-OM-P ternary complexes, further evidenced by FTIR results. In a reducing environment, the protein-like component (C3) and terrestrial humic-like component (C2) will biodegrade. In the process of C3 biodegradation, FeOX1 will act as electron acceptors and then undergo reductive

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Author

Xinxin Zhang; Xianzhong Ke; Yao Du; Yanqiu Tao; Jiangkai Xue; Qinghua Li; Xianjun Xie; Yamin Deng

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)