Interactions of riverine suspended particulate matter with phosphorus inactivation agents across sediment-water interface and the implications for eutrophic lake restoration
Interactions of riverine suspended particulate matter with phosphorus inactivation agents across sediment-water interface and the implications for eutrophic lake restoration
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河流悬浮颗粒物与沉积物-水界面磷灭活剂的相互作用及其对富营养化湖泊恢复的影响
DOI：
10.1016/j.cej.2017.06.099
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发表时间：
2017-11-01
影响因子：
15.1
通讯作者：
Liu, Cheng
中科院分区：
文献类型：
--
作者：
Yin, Hongbin;Du, Yingxun;Liu, Cheng
在湖泊富营养化治理中，磷(P)灭活剂（PIAs）被广泛应用。然而，河流悬浮颗粒物（SPM）与PIA的相互作用尚未被阐明到PIA在富营养化湖泊中应用成功的完全可信的程度。本研究通过长期的田间培养试验，探讨了河流SPM对沉积物内部磷管理的影响。采用荧光激发发射矩阵耦合平行因子（EEM-PARAFAC）对SPM/沉积物中溶解有机物（DOM）进行了表征，并研究了其与两种pia中La （III）和Ca （II）的络合作用。在这些样品中发现了一种蛋白质和两种腐殖质样成分，它们表现出La （III）和Ca （II）的不同猝灭作用。SPM的持续沉降可以将pia埋深到沉积物层中，同时增加表层沉积物的流动磷含量。这导致了P通量和表层沉积物反应性的增加，这可以通过薄膜扩散梯度（DGT）测量的不稳定P浓度的增加来证明。然而，在6个月的田间试验中，pia对沉积物流动磷的结合能力一直保持在埋地层中。本研究表明，河流SPM对pia的影响机制是通过与DOM络合降低pia的活性吸附位点，不断增加表层沉积物中流动磷含量，从而大大超过其最大吸磷能力。对于长期管理中河流SPM高投入的浑浊富营养化湖泊，定期重复投加效果较好。(C) 2017 Elsevier B.V.版权所有
Phosphorus (P) inactivation agents (PIAs) have been widely used in lakes for eutrophic management. However, the interactions of riverine suspended particulate matter (SPM) with PIAs have not been elucidated to the point of complete confidence in the success of PIA application to eutrophic lakes. In this study, a long-term field incubation experiment was carried out to investigate the effects of riverine SPM on sediment internal P management. Fluorescence excitation emission matrix coupled with parallel factor (EEM-PARAFAC) was used to characterize dissolved organic matter (DOM) derived from SPM/sediment, and to study its complexation with La (III) and Ca (II) contained in two PIAs. The analysis identified one protein-and two humic-like components in these samples, which show variable quenching effects by La (III) and Ca (II). The continuous settling of SPM can bury PIAs deeper into the sediment layers and while increasing the mobile P content in surface sediments. This consequently made an increase of P fluxes and surface sediment reactivity, which was witnessed by the increased labile P concentration measured by diffusive gradient in film (DGT). However, the binding capacity of PIAs towards sediment mobile P was kept in a buried layer during the six months' field experiment. This study indicates that the influence mechanism of riverine SPM on PIAs was through a decrease of the reactive sorption sites of PIAs by complexing with DOM and continuously increasing the mobile P content in surface sediment thereby largely surpassing their maximum P sorption capacity. Repeated dosing at scheduled times would be better for turbid eutrophic lake remediation with high input of riverine SPM in long-term management. (C) 2017 Elsevier B.V. All rights reserved.