Macropore–matrix mass transfer of reactive solutes quantified by fluorescence imaging
Macropore–matrix mass transfer of reactive solutes quantified by fluorescence imaging
复制标题
通过荧光成像量化反应性溶质的大孔基质传质
DOI：
10.1002/vzj2.20078
复制
发表时间：
2020
影响因子：
2.8
通讯作者：
Ellerbrock
中科院分区：
文献类型：
--
作者：
Ellerbrock
用荧光染料（例如，Na-荧光素）可能允许定量反应性溶质通过涂覆的大孔表面的大孔-基质传质。目的是（a）确定活性和荧光染料的运动并绘制其空间质量分布（即，Na‐荧光素），以及（B）通过将荧光成像定量的总质量与总应用染料质量进行比较来验证该方法。对于染料溶解质量的定量，将使用Hydrus-1D从水平流模拟获得的毫米级分布水含量乘以映射的染料溶液浓度。染料浓度的空间分布是可视化的，并在像素分辨率长度为100 μm的荧光成像技术进行定量。使用校准的Freundlich吸附模型推导出吸附染料浓度的亚毫米尺度分布图。吸附等温线预测，大部分的染料吸附到土壤中。总共有1，366 μg染料通过涂覆的基质块转移，其中1，181 μg被吸附到土壤中。通过比较上样和回收的Na-荧光素质量（对应性相对密切），验证了该方法的适用性。虽然这里提出的方法的测试是有限的局部分布的水含量和体积密度的不确定性，该方法可以应用于映射二维水平分布的染料在一个完整的土壤土块量化大孔基质的反应性溶质的传质。
Horizontal infiltration experiments with a fluorescent dye (e.g., Na‐fluorescein) potentially allow the quantification of the macropore–matrix mass transfer of reactive solutes through coated macropore surfaces. The objectives were (a) to determine the movement and map the spatial mass distributions of a reactive and fluorescent dye (i.e., Na‐fluorescein) at the millimeter scale during horizontal tracer application to the intact structural surface of a soil aggregate, and (b) to validate the method by comparing total masses as quantified withFluorescence imagingwith total applied dye masses. For the quantification of dissolved masses of dye, millimeter‐scaled distributed water contents obtained from horizontal flow simulation using Hydrus‐1D were multiplied with mapped dye solution concentrations. The spatial distribution of dye concentrations was visualized and quantified with a fluorescence imaging technique at a pixel resolution length of ∼100 μm. Submillimeter‐scaled distribution maps of adsorbed dye concentrations were derived using the calibrated Freundlich adsorption model. The sorption isotherm predicted that most of the dye was adsorbed to soil. In total, 1,366 μg of dye was transferred through the coated matrix block, of which 1,181 μg was adsorbed to soil. The applicability of the method was validated by comparing applied and recovered Na‐fluorescein masses, which corresponded relatively closely. Although the test of the approach presented here was limited by uncertainties regarding the local distributions of water contents and bulk density, the method could be applied to map two‐dimensional horizontal distributions of dye in an intact soil clod for quantifying macropore–matrix mass transfer of the reactive solute.
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DOI：
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发表时间：
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期刊：
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