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| 基于DGT的水库沉积物-水界面磷-铁-硫协同变化与交换通量特征研究 |
| DGT Based Synergistic Variations and Exchange Flux Characteristics of Phosphorus Iron Sulfur at Sediment Water Interface in A Reservoir |
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| DOI： |
| 中文关键词: 磷-铁-硫 交换通量 梯度扩散薄膜技术 沉积物-水界面 竹仙洞水库 |
| 英文关键词: Phosphorus iron sulfur Exchange flux DGT Sediment water interface Zhuxiandong Reservoir |
| 基金项目:国家自然科学青年基金资助项目（42207265）；珠海市社会发展领域科技计划基金资助项目（2420004000307）；广东省基础与应用基础研究基金区域联合基金-青年基金资助项目（2021A1515110339） |
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| 中文摘要: |
| 通过结合离心法与梯度扩散薄膜技术（DGT），原位定量表征珠海竹仙洞水库沉积物〖CD*2〗水界面系统中重金属的固〖CD*2〗液相迁移动力学过程。结果表明：湖心区域的硫化物测定值显著高于进水口，更多的有机物沉积可能是硫化物积聚的主要原因；通过离心法获得的总磷和有机磷值随着深度的增加而增大，无机磷值虽然波动但总体变化不明显，而铁值则表现出较大的波动性；通过DGT获得的沉积物间隙水中的无机磷、铁和硫通量在沉积物〖CD*2〗水界面发生剧烈变化并迅速增加，在进水口和湖心区域，铁和硫在沉积物〖CD*2〗水界面以下相近的位置出现峰值，无机磷也表现出类似趋势；沉积物间隙水中金属元素主要以离子形式存在，少部分为固相沉淀。 |
| 英文摘要: |
| This study in situ quantitatively characterized the kinetics processes of solid liquid phase migration of heavy metals at the sediment water interface of Zhuxiandong Reservoir in Zhuhai based on centrifugation and diffusive gradients in thin films（DGT）. The results showed that sulfide concentrations in the central lake area were significantly higher than those at the inlet. Increased deposition of organic matter might be the main cause of sulfide accumulation. The concentrations of total phosphorus and organic phosphorus obtained by centrifugation increased with depth， whereas inorganic phosphorus concentration fluctuated with no significant overall change， and iron concentration exhibited considerable variability. The fluxes of inorganic phosphorus， iron and sulfur in sediment porewater by DGT changed dramatically and increased rapidly at the sediment water interface. At the inlet and central lake area， 〖GK!87mm〗the concentrations of iron and sulfur exhibited peaks at similar depths below the sediment water interface， with inorganic phosphorus showing a similar trend. Metal elements in sediment porewater primarily existed in ionic form， with a small portion in the form of solid precipitates. |
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