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Arsenic mobilization across the sediment-water interface of the Three Gorges Reservoir as a function of water depth using DGT and HR-Peepers, a preliminary study
Ecotoxicology and Environmental Safety ( IF 6.2 ) Pub Date : 2024-04-04 , DOI: 10.1016/j.ecoenv.2024.116276 Yingqun Ma 1 , Chenchen Yang 2 , Zhichao Liu 2 , Chaonan Han 3 , Yanwen Qin 2
Ecotoxicology and Environmental Safety ( IF 6.2 ) Pub Date : 2024-04-04 , DOI: 10.1016/j.ecoenv.2024.116276 Yingqun Ma 1 , Chenchen Yang 2 , Zhichao Liu 2 , Chaonan Han 3 , Yanwen Qin 2
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The artificial regulation of the Three Gorges Reservoir (TGR) creates large water level fluctuation zones (WLFZ) that may change the behavior of metals and metalloid in sediment, particularly redox sensitive elements. Mobilization of As, Fe and Mn across the sediment-water interface (SWI) in the TGR as a function of different water depth (periodically and permanently submerged sediments, respectively) was in situ determined by diffusive gradients in thin films (DGT) and high-resolution dialysis technique (HR-Peeper), respectively. The results showed that the mobilization of As was significantly affected by Fe/Mn especially Mn, across the SWI. Duo to the oxic-anoxic transitional state in near bottom water, the reduced Fe and Mn in sediment pore water could be oxidized and precipitated again, leading to the co-precipitation of As with Fe/Mn oxides (hydroxides). Consequently, concentrations of As, Fe and Mn in labile phases and pore water were generally low across the SWI, then they sharply increased at a few centimeters below the SWI. Considering different water depth, various trends were found in labile phase, whereas concentrations of As, Fe and Mn in pore water in permanently submerged sediments were significantly higher than those in periodically submerged sediments. The dry-re-wetting alternation processes in the WLFZ may play vital roles in the resupply capacity of sediments as it was found that periodically submerged sediments with longer re-wetting time had higher Fe/Mn resupply capacity than those with shorter re-wetting times and permanently submerged sediments.
中文翻译：
使用 DGT 和 HR-Peepers 进行的三峡水库沉积物-水界面砷迁移随水深变化的初步研究
三峡水库（TGR）的人工调节产生了大的水位波动区（WLFZ），可能会改变沉积物中金属和非金属的行为，特别是氧化还原敏感元素。 As、Fe 和 Mn 在 TGR 中沉积物-水界面 (SWI) 的迁移量与不同水深（分别是周期性和永久淹没的沉积物）的函数关系是通过薄膜 (DGT) 和高浓度扩散梯度原位确定的。 -分辨率透析技术（HR-Peeper）。结果表明，SWI 上 As 的迁移受到 Fe/Mn 尤其是 Mn 的显着影响。由于近底水的缺氧过渡状态，沉积物孔隙水中被还原的Fe和Mn被氧化并再次沉淀，导致As与Fe/Mn氧化物（氢氧化物）共沉淀。因此，整个 SWI 上不稳定相和孔隙水中的 As、Fe 和 Mn 浓度通常较低，然后在 SWI 以下几厘米处急剧增加。考虑到不同水深，不稳定相表现出不同的变化趋势，而永久淹没沉积物孔隙水中As、Fe和Mn的浓度显着高于周期性淹没沉积物。 WLFZ的干-再润湿交替过程可能对沉积物的补给能力起着至关重要的作用，因为我们发现，重润时间较长的周期性淹没沉积物比重润时间较短的周期性淹没沉积物具有更高的Fe/Mn补给能力和永久淹没的沉积物。
更新日期：2024-04-04
中文翻译：
使用 DGT 和 HR-Peepers 进行的三峡水库沉积物-水界面砷迁移随水深变化的初步研究
三峡水库（TGR）的人工调节产生了大的水位波动区（WLFZ），可能会改变沉积物中金属和非金属的行为，特别是氧化还原敏感元素。 As、Fe 和 Mn 在 TGR 中沉积物-水界面 (SWI) 的迁移量与不同水深（分别是周期性和永久淹没的沉积物）的函数关系是通过薄膜 (DGT) 和高浓度扩散梯度原位确定的。 -分辨率透析技术（HR-Peeper）。结果表明，SWI 上 As 的迁移受到 Fe/Mn 尤其是 Mn 的显着影响。由于近底水的缺氧过渡状态，沉积物孔隙水中被还原的Fe和Mn被氧化并再次沉淀，导致As与Fe/Mn氧化物（氢氧化物）共沉淀。因此，整个 SWI 上不稳定相和孔隙水中的 As、Fe 和 Mn 浓度通常较低，然后在 SWI 以下几厘米处急剧增加。考虑到不同水深，不稳定相表现出不同的变化趋势，而永久淹没沉积物孔隙水中As、Fe和Mn的浓度显着高于周期性淹没沉积物。 WLFZ的干-再润湿交替过程可能对沉积物的补给能力起着至关重要的作用，因为我们发现，重润时间较长的周期性淹没沉积物比重润时间较短的周期性淹没沉积物具有更高的Fe/Mn补给能力和永久淹没的沉积物。
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