The Tritium Processing Facility at the Savannah River Site releases effluent containing copper (Cu), zinc (Zn), and lead (Pb) to the H-02 constructed wetland for remediation before the final release. Sediment cores were collected in the wetland cells in both summer and winter. Concentrations of total metals in all sediment layers and acid-volatile sulfide (AVS) and simultaneously extracted metals (SEM) in surface sediments were determined. Total metal concentrations suggested most metals removed from surface water were retained by the organic-rich flocculent in the top sediment layers instead of being transported to the deeper sulfide mineral layers. The seasonal difference of AVS and SEM indicated a season-related sulfur cycle and metal removal process in the wetland cells. SEM-Zn was the major contributor to total SEM. Metals accumulating in surface sediments were mainly sequestered in AVS and SEM extractable phases including metal-sulfides and organic matter complexes. The general SEM/AVS ratio was > 1, demonstrating the metals associated with sediments were potentially mobile and/or bioavailable, which becomes a concern for the long-term sustainability of the constructed wetland. The disturbance event in the sediment triggered the release of total metals, which were mostly in particulate form and were not bioavailable. Due to the high levels of reduced ion (Fe) in the sediment, the released particulate metals were likely to form metal-scavenging particulate Fe³⁺ oxyhydroxides under oxic conditions.

萨凡纳河场的处理设施将含有铜（Cu），锌（Zn）和铅（Pb）的废水排放到H-02人工湿地中，以进行最终修复。在夏季和冬季，都在湿地单元中收集了沉积物芯。测定所有沉积物层中总金属的浓度以及表面沉积物中酸挥发性硫化物（AVS）和同时提取的金属（SEM）的浓度。总金属浓度表明，从地表水中去除的大多数金属被富含有机物的絮凝剂保留在顶部沉积层中，而不是被运输到更深的硫化物矿物层中。AVS和SEM的季节差异表明湿地细胞中与季节相关的硫循环和金属去除过程。SEM-Zn是总SEM的主要贡献者。沉积在表面沉积物中的金属主要被螯合在AVS和SEM可萃取相中，包括金属硫化物和有机物络合物。SEM / AVS的一般比率> 1，这表明与沉积物相关的金属具有潜在的移动性和/或生物利用度，这成为人工湿地长期可持续性的一个问题。沉积物中的扰动事件触发了总金属的释放，这些金属大多数以颗粒形式存在，无法生物利用。由于沉积物中高水平的还原离子（Fe），释放的颗粒金属很可能形成清除金属的颗粒Fe 证明与沉积物相关的金属可能是可移动的和/或可生物利用的，这已成为人工湿地长期可持续性的关注点。沉积物中的扰动事件触发了总金属的释放，这些金属大多数以颗粒形式存在，无法生物利用。由于沉积物中高水平的还原离子（Fe），释放的颗粒金属很可能形成清除金属的颗粒Fe 证明与沉积物相关的金属可能是可移动的和/或可生物利用的，这已成为人工湿地长期可持续性的关注点。沉积物中的扰动事件触发了总金属的释放，这些金属大多数以颗粒形式存在，无法生物利用。由于沉积物中高水平的还原离子（Fe），释放的颗粒金属很可能形成清除金属的颗粒Fe在有氧条件下³⁺羟基氧化物。