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首页> 外文期刊>Environmental Science & Technology >Noninvasive Quantitative Measurement of Colloid Transport in Mesoscale Porous Media Using Time Lapse Fluorescence Imaging
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Noninvasive Quantitative Measurement of Colloid Transport in Mesoscale Porous Media Using Time Lapse Fluorescence Imaging

机译：使用时移荧光成像技术对中尺度多孔介质中胶体运输的无创定量测量

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摘要

We demonstrate noninvasive quantitative imaging of colloid and solute transport at millimeter to decimeter (meso-)scale.Ultraviolet (UV)excited fluorescent solute and colloid tracers were independently measured simultaneously during co-advection through saturated quartz sand.Pulse-input experiments were conducted at constant flow rates and ionic strengths 10~(-3),10~(-2)and 10~(-1)M NaCI.Tracers were 1.9 mu m carboxylate latex microspheres and disodium fluorescein.Spatial moments analysis was used to quantify relative changes in mass distribution of the colloid and solute tracers over time.The solute advected through the sand at a constant velocity proportional to flow rate and was described well by a conservative transport model (CXTFIT).In unfavorable deposition conditions increasing ionic strength produced significant reduction in colloid center of mass transport velocity over time.Velocity trends correlated with the increasing fraction of colloid mass retained along the flowpath.Attachment efficiencies (defined by colloid filtration theory)calculated from nondestructive retained mass data were 0.013 +-0.03,0.09 +-0.02,and 0.22 +-0.05 at 10~(-3),10~(-2),and 10~(-1)M ionic strength,respectively,which compared well with previously published data from breakthrough curves and destructive sampling.Mesoscale imaging of colloid mass dynamics can quantify key deposition and transport parameters based on noninvasive,nondestructive,spatially high-resolution data.
机译：我们展示了毫米至分米（mes-）尺度上胶体和溶质传输的无创定量成像。在通过饱和石英砂的共对流过程中，紫外线（UV）激发的荧光溶质和胶体示踪剂是同时独立测量的。恒定的流速和10〜（-3），10〜（-2）和10〜（-1）M NaCl的离子强度。追踪剂为1.9μm羧酸胶乳微球和荧光素二钠。空间矩分析用于量化相对变化随着时间的流逝，溶质以恒定的速度与流速成比例地流过沙子，并通过保守的输运模型（CXTFIT）进行了很好的描述。在不利的沉积条件下，增加的离子强度会导致离子强度显着降低。随着时间的流逝，胶体质心传输速度的中心速度变化趋势与沿流路保留的胶体质量分数增加有关。由无损保留质量数据计算出的传质效率（0.09 + -0.03、0.09 + -0.02和10〜（-3），10〜（-2）和10〜（0.2）+ -0.05 -1）离子强度分别与突破曲线和破坏性采样先前发表的数据相比较。胶体质量动力学的中尺度成像可以基于无创，无损，空间高分辨率数据量化关键沉积和传输参数。

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  • 来源
    《Environmental Science & Technology》 |2006年第19期|p.5930-5936|共7页
  • 作者

    JONATHAN W.BRIDGE; STEVEN A.BANWART; A.LOUISE HEATHWAITE;

  • 作者单位

    Groundwater Protection and Restoration Group,Department of Civil and Structural Engineering,Kroto Research Institute,North Campus,University of Sheffield,Broad Lane,Sheffield,S3 7HQ,U.K.;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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