Concentration gradients in the solid fraction and pore water of modern sediments allow to identify benthic biogeochemical processes and the associated fluxes. Gradients are often obtained from layers sampled below the sediment–water interface from sediment cores. Numerous examples in the literature show results from cores collected in impermeable porous sediments, but very few from permeable sediment cores. Indeed, the acquisition of vertical profiles in sandy permeable sediments with a spatiotemporal resolution equivalent to that of muddy sediments is a challenge. We present here a simple protocol that allows sampling of sandy sediments and their interstitial waters with a vertical resolution of 1 cm. This method is suitable for shallow environments, such as intertidal zones, lakes, lagoons, and stream beds. The method is based on rapid conditioning of hand‐collected cores. The cores are pre‐cut lengthwise. Immediately after recovery, they are laid horizontally, opened, and sliced. Interstitial water is collected by centrifugation on site shortly after cutting the core with tubes equipped with a 0.2 μm membrane. Optimally, 30 min is sufficient between core collection and conditioning of 12 sections of a 20‐cm long core. The examples shown indicate that the method is reproducible. Reduced dissolved compounds such as Fe(II), Mn(II), and NH₄⁺ show profiles without significant oxidation. At the time of core cutting, small volumes of pore water are seeping out of the core, but for sediments with a permeability of up to 10⁻¹⁰ m², this seepage does not disturb the shape of the pore‐water profiles.

中文翻译：

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在湖泊，溪流和沿海地区的沙质可渗透沉积物中以厘米分辨率对孔隙水进行采样

现代沉积物的固体部分和孔隙水中的浓度梯度可以确定底栖生物地球化学过程和相关的通量。梯度通常是从沉积物核心的沉积物-水界面下方采样的层中获得的。文献中的许多例子显示了从不可渗透的多孔沉积物中收集的岩心得到的结果，但很少见于可渗透的沉积物岩心中的结果。的确，以时空分辨率等于泥质沉积物的时空分辨率获得含沙渗透性沉积物的垂直剖面是一个挑战。我们在这里提出一个简单的协议，允许以1厘米的垂直分辨率对沙质沉积物及其间质水进行采样。此方法适用于潮间带，湖泊，泻湖和河床等浅层环境。该方法基于对手工收集的磁芯的快速调节。芯子是纵向切割的。恢复后，将它们水平放置，打开并切成薄片。在用装有0.2的管子切开岩心后不久，通过现场离心收集间隙水μ微米的膜。最佳的是，在收集岩芯和调节20厘米长岩心的12个部分之间至少需要30分钟。所示的实例表明该方法是可重现的。还原的溶解的化合物（例如Fe（II），Mn（II）和NH ₄ ^+）显示出没有明显氧化的分布。在岩心切割时，少量的孔隙水从岩心中渗出，但是对于渗透率高达10 ^-10 m ^2的沉积物，这种渗漏不会干扰孔隙水剖面的形状。