Distribution of oxygen in marine sediments measured with microelectrodes1
Distribution of oxygen in marine sediments measured with microelectrodes1
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DOI：
10.4319/lo.1980.25.3.0403
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发表时间：
1980-05
影响因子：
4.5
通讯作者：
N. Revsbech;J. Sørensen;T. Blackburn;J. P. Lomholt
中科院分区：
文献类型：
--
作者：
N. Revsbech;J. Sørensen;T. Blackburn;J. P. Lomholt
。摘要采用尖端直径为2 ~ 8pm的膜覆盖铂电极，对海洋沉积物中的溶解氧进行了安培分析。无光照沉积物中氧剖面延伸至3 ~ 5mm深度；即使在强光强和低温下，在均匀的砂质沉积物中，它也不会延伸到低毫米深度以下。在光-暗循环中记录的氧分布被用来估计氧气的产生和消耗速率，也用来计算氧气在沉积物中的表观扩散系数。显然，大型动物的活动，而不是分子扩散和水湍流，对氧气偶尔运输到更深的层，从而在沉积物表面以下5-10厘米处提供氧化条件（正氧化还原电位）很重要。
. Abstract Membrane-covered platinum electrodes with a tip diameter of 2-8 pm were used for an amperometric assay of dissolved oxygen in marine sediments. The oxygen profile extended to 3-5mm depth in nonilluminated sediment; even at high light intensities and at low tem- peratures it did not extend below lo-mm depth in a homogeneous sandy sediment. Oxygen profiles recorded during light-dark cycles were used to estimate the rates of oxygen produc- tion and consumption and also to calculate the apparent diffusion coefficient for oxygen in the sediment. Apparently macrofaunal activity, rather than molecular diffusion and water turbulence, was important for the occasional transport of oxygen into deeper layers and thus for the provision of oxidized conditions (positive redox potential) down to 5-10 cm below the sediment surface.