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首页> 外文期刊>Fundamental and applied limnology >Colloid characterization at the sediment-water interface of Vidy Bay, Lake Geneva
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Colloid characterization at the sediment-water interface of Vidy Bay, Lake Geneva

机译：日内瓦湖维迪湾沉积物-水界面的胶体特征

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摘要

Colloids play a critical role in the transport of particle-bound contaminants. Knowledge of colloids and their aggregates provides insight into contaminant transport and fate within a given aquatic environment. Here, colloids and aggregates at the sediment-water interface of Vidy Bay, Lake Geneva, Switzerland, were characterized with a combination of analytical techniques to understand their structure, size distribution, concentration, and stability (the potential for aggregation). Vidy Bay is known to be the most contaminated part of Lake Geneva, being influenced by the effluents of a municipal wastewater treatment plant. Colloids were a heterogeneous mix of inorganic constituents (diatom fragments, quartz, clay, endogenic calcite, iron oxy-hydroxides) bridged together by rigid biopolymer strands or gels. The presence of rigid biopolymers was quite significant and they were typically found to have iron oxy-hydroxides embedded within their structure. Ion chromatographic data were comparable to previous values attained for the water column of Lake Geneva; however, single particle counting results indicated the presence of a nepheloid layer in Vidy Bay. In such, the stability of colloids was likely influenced by their proximity to the sediment-water interface. Zeta potential results inferred charge neutralization and destabilization of colloids and aggregates. Self-assembly of rigid biopolymers, along with cationic bridging between rigid biopolymers and inorganic constituents readily aggregated colloids. Taken together, colloids at the sediment water interface of Vidy Bay appeared to be unstable and to play a minor role in the transport of contaminants over long distances.
机译：胶体在结合颗粒的污染物的运输中起着至关重要的作用。胶体及其聚集体的知识可以洞察给定水生环境中的污染物运输和命运。在此，结合分析技术对位于瑞士日内瓦湖维迪湾的沉积物-水界面处的胶体和聚集体进行了表征，以了解其结构，尺寸分布，浓度和稳定性（聚集的潜力）。维迪湾被认为是日内瓦湖受污染最严重的部分，受到市政污水处理厂废水的影响。胶体是无机成分（硅藻碎片，石英，粘土，内生方解石，羟基氧化铁）通过刚性生物聚合物链或凝胶桥接在一起的异质混合物。刚性生物聚合物的存在非常重要，通常发现它们的结构中嵌入了羟基氧化铁。离子色谱数据与日内瓦湖水柱获得的先前值相当;然而，单颗粒计数结果表明在维迪湾中存在肾上腺皮质层。在这种情况下，胶体的稳定性很可能受到其与沉积物-水界面的接近程度的影响。 Zeta电位可导致胶体和聚集体的电荷中和和去稳定。刚性生物聚合物的自组装，以及刚性生物聚合物与无机成分之间的阳离子桥联容易使胶体聚集。两者合计，Vidy Bay沉积物水界面处的胶体似乎不稳定，并且在长距离污染物输送中起次要作用。

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