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Sediment Core Sectioning and Extraction of Pore Waters under Anoxic Conditions

机译:缺氧条件下沉积物芯切分与孔隙水提取

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摘要

We demonstrate a method for sectioning sediment cores and extracting pore waters while maintaining oxygen-free conditions. A simple, inexpensive system is built and can be transported to a temporary work space close to field sampling site(s) to facilitate rapid analysis. Cores are extruded into a portable glove bag, where they are sectioned and each 1-3 cm thick section (depending on core diameter) is sealed into 50 ml centrifuge tubes. Pore waters are separated with centrifugation outside of the glove bag and then returned to the glove bag for separation from the sediment. These extracted pore water samples can be analyzed immediately. Immediate analyses of redox sensitive species, such as sulfide, iron speciation, and arsenic speciation indicate that oxidation of pore waters is minimal; some samples show approximately 100% of the reduced species, e.g. 100% Fe(II) with no detectable Fe(III). Both sediment and pore water samples can be preserved to maintain chemical species for further analysis upon return to the laboratory.
机译:我们展示了一种在保持无氧条件的同时,对沉积物芯进行切片并提取孔隙水的方法。构建了一个简单,廉价的系统,可以将其运输到靠近现场采样地点的临时工作空间,以利于快速分析。将芯挤出到便携式手套袋中,在其中进行切片,并将每个1-3厘米厚的部分(取决于芯直径)密封到50 ml离心管中。离心分离手套袋外部的孔隙水,然后返回手套袋与沉淀物分离。这些提取的孔隙水样品可以立即进行分析。立即对氧化还原敏感物质(例如硫化物,铁形态和砷形态)的分析表明,孔隙水的氧化作用极小。一些样品显示约100%的还原物种,例如100%Fe(II),无可检测到的Fe(III)。沉积物和孔隙水样品均可保存,以保留化学物质,以便返回实验室后进行进一步分析。

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