Vicente M C, Trevisan C L, Carvalho A C B, Machado W T, Wasserman J C
Post-Graduate Program in Geochemistry, Universidade Federal Fluminense, 24.020-141 Niterói RJ, Brazil.
MethodsX. 2022 Jun 4;9:101751. doi: 10.1016/j.mex.2022.101751. eCollection 2022.
During the last decades, metals have been released into coastal areas increasing the environmental and human health risks, however, resuspension events of trace metals polluted sediment could represent even more severe risks. Anoxic condition in the sediment is capable to stabilize the trace metals, due to the bonding with reduced anions. Although, the sediment resuspension can alter the potential redox and pH characteristics resulting in metals released from the water column. The climate change advance would impact directly on ocean chemistry, is expected the spatial increase of anoxic sites, mainly in coastal areas. Furthermore, it is mandatory and urgent to expand the knowledge over the process of sediment metals releasing in order to develop prediction and remediation tools for possible environmental impacts. This is a simple method of manipulating and simulating physicochemical alterations. The creation of microcosmos without oxygen allows the formation of a very reducible environment, common in coastal areas with low energy and high organic matter input. And further oxidation allows the assessment of the trace metals released to the water column and/or the new arrangement of these metals in different geochemical fractions. • The experimental procedure to assess trace metals mobility to potential redox and pH changes in sediment and water. • A method is suitable for a wild range of sediment characteristics.
在过去几十年中，金属被排放到沿海地区，增加了环境和人类健康风险，然而，痕量金属污染沉积物的再悬浮事件可能带来更严重的风险。沉积物中的缺氧条件能够使痕量金属稳定，这是由于与还原态阴离子结合的缘故。尽管如此，沉积物再悬浮会改变潜在的氧化还原和pH特性，导致金属从水柱中释放出来。气候变化的推进将直接影响海洋化学，预计缺氧区域的空间会增加，主要在沿海地区。此外，迫切需要扩展对沉积物中金属释放过程的认识，以便开发针对可能的环境影响的预测和修复工具。这是一种操纵和模拟物理化学变化的简单方法。创建无氧微宇宙可以形成一个极易还原的环境，这在能量低且有机物输入高的沿海地区很常见。进一步的氧化可以评估释放到水柱中的痕量金属，以及这些金属在不同地球化学组分中的新排列。• 评估沉积物和水中痕量金属迁移率对潜在氧化还原和pH变化的实验程序。• 一种适用于多种沉积物特征的方法。
