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首页> 外文期刊>Transport in Porous Media >Evaluating Differences in Transport Behavior of Sodium Chloride and Brilliant Blue FCF in Sand Columns
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Evaluating Differences in Transport Behavior of Sodium Chloride and Brilliant Blue FCF in Sand Columns

机译：评估氯化钠和亮蓝FCF在砂柱中的传输行为差异

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Groundwater tracers such as sodium chloride (NaCl) and the food color brilliant blue FCF (BBF) had been widely used to evaluate flow dynamics, but the possible discrepancy of transport dynamics between the two tracers through a same medium remains obscure. In order to fill this knowledge gap, we combined laboratory experiments and model analysis for transport of the above tracers. We first conducted three progressive experiments, including (1) transport experiments of NaCl and BBF through saturated sand columns packed with uniform glass beads; (2) transport experiments of the two tracers through silica sand columns as a function of travel distances and flow rates; and (3) a long-term adsorption experiment exploring the adsorption of the two tracers to silica sands. All laboratory results show that NaCl exhibits slower and smaller peaks in tracer breakthrough curves than BBF. Further model analysis using the standard advection-dispersion equation (with a retardation coefficient to account for equilibrium sorption) demonstrates that the NaCl plume has a larger dispersion coefficient than that of BBF. Both the laboratory and a pseudo-kinetic model also reveal that NaCl might be observed more by the medium than BBF. Therefore, although NaCl is well known to be a more conservative tracer than BBF, our laboratory and numerical experiments suggest the opposite. NaCl can be less conservative than BBF through laboratory-scale sand columns, probably due to (1) stronger sorption of NaCl to silica sand, and/or (2) relatively stronger mass exchange between mobile and immobile zones in macroscopically homogeneous porous media.
机译：地下水示踪剂，例如氯化钠（NaCl）和食用色素亮蓝色FCF（BBF）已被广泛用于评估流动动力学，但两种示踪剂在同一介质中的传输动力学可能存在差异，这一点仍然不清楚。为了填补这一知识空白，我们将实验室实验和模型分析相结合来运输上述示踪剂。我们首先进行了三个渐进实验，包括（1）NaCl和BBF通过装有均匀玻璃珠的饱和砂柱的传输实验； （2）两种示踪剂通过硅砂柱的运输实验，作为行进距离和流速的函数； （3）一项长期吸附实验，探讨了两种示踪剂对硅砂的吸附。所有实验室结果表明，NaCl在示踪剂穿透曲线中的峰比BBF慢且小。使用标准对流扩散方程式（具有用于平衡吸附的延迟系数）进行的进一步模型分析表明，NaCl羽流的分散系数比BBF大。实验室模型和拟动力学模型都还表明，相比于BBF，在培养基中观察到的NaCl可能更多。因此，尽管众所周知，NaCl是比BBF更保守的示踪剂，但我们的实验室和数值实验表明情况恰恰相反。通过实验室规模的砂柱，NaCl的保守性不如BBF，这可能是由于（1）NaCl对硅砂的吸附更强，和/或（2）在宏观上均一的多孔介质中，可移动和不可移动区域之间的质量交换相对较强。

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