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Enhanced semipermanent dialysis samplers for long-term environmental monitoring in saturated sediments

机译：增强型半永久性透析采样器，可对饱和沉积物进行长期环境监测

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摘要

The ability to sample in situ natural environmental processes has proven to be challenging when working with redox-sensitive contaminates in saturated sediments in wetland systems, especially within the rhizosphere, where sharp redox gradients are common. Many traditional approaches are invasive and disturb natural sediment chemistry. Through laboratory and field studies, the work presented in this study demonstrates a novel semipermanent dialysis sampler that allows for long-term, anaerobic monitoring of shallow sediments. Dialysis samplers were deployed and tested for over 1 year while being exposed to extremes in climate. These newly designed devices produce statistically reproducible data and capture sensitive redox trends. Results from the newly designed samplers were compared to conventional samplers. Initially, both the new and old designs yielded statistically similar data, but these data diverged over a period of months. The new devices are less invasive, so data gathered from these devices are more likely to be a closer representation of true conditions in the subsurface. By giving reliable data from a consistent location in space, these new samplers represent a significant step forward in capturing spatial and temporal variability in wetland redox chemistry during long-term monitoring.
机译：当处理湿地系统中饱和沉积物中的氧化还原敏感污染物时，尤其是在存在急剧氧化还原梯度的根际内，对原位自然环境过程进行采样的能力已证明具有挑战性。许多传统方法都是侵入性的，会干扰自然沉积物的化学作用。通过实验室和现场研究，本研究提出的工作证明了一种新型的半永久性透析采样器，可对浅层沉积物进行长期厌氧监测。透析采样器在暴露于极端气候下的同时部署和测试了一年以上。这些新设计的设备可产生统计上可重现的数据并捕获敏感的氧化还原趋势。新设计的采样器的结果与常规采样器进行了比较。最初，新设计和旧设计在统计上都产生相似的数据，但是这些数据在几个月的时间内出现了分歧。新设备的侵入性较小，因此从这些设备收集的数据更有可能更准确地表示地下真实条件。通过从空间中一致的位置提供可靠的数据，这些新型采样器代表了在长期监测过程中捕获湿地氧化还原化学的时空变化方面的重要一步。

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