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Fate and transport of bromide and mononuclear aromatic hydrocarbons in aqueous solutions through Berea Sandstone
Science of the Total Environment ( IF 9.8 ) Pub Date : 2020-09-14 , DOI: 10.1016/j.scitotenv.2020.141714
Steven P. Labrecque , William J. Blanford

A series of miscible displacement tests were performed on a 51 mm wide by 76 mm long well-laminated core of Berea Sandstone to determine the transport parameters of the anion bromide and a homologous series of seventeen mononuclear aromatic hydrocarbons (MAHs). In each test, a continuous input pulse of a single tracer was passed through the cylindrical core housed in a hydrostatic core holder at a confining pressure of 200 bar. The effluent concentration, as measured by in-line UV absorbance, versus time resulted in smooth high-resolution sinusoidal breakthrough curves (BTCs). In comparison to the near Gaussian BTCs of bromide, the transport of the MAHs was differentially retarded with minimal levels of delayed transport along the more rapid flow lines, but with progressively more along the slower flow paths. These results show that despite a lack of significant hydraulic heterogeneity, there is a high degree of heterogeneity among the sorption sites. The BTCs were aptly modeled with a one-dimensional flow model consisting of a mixture of instantaneous equilibrium and rate-limited reversible sorption sites. The relative fraction of instantaneous sites increased proportionately with the rate the subject MAH passed through the core. Potential quantitative structure-retention relationships (QSRR) between common chemical parameters of the MAHs and their overall retardation factors, sorption coefficients and the fraction of instantaneous equilibrium were evaluated. Among the compounds examined, relatively strong correlations were found with molecular weight, aqueous solubility, and octanol-water partitioning coefficient with which relative MAH transport retardation, the linear phase distribution coefficient, and the dimensionless partitioning coefficient between sorption sites.



中文翻译:

水溶液中溴化物和单核芳香烃通过Berea砂岩的命运和运输

在Berea砂岩的51 mm宽x 76 mm长的层状岩心上进行了一系列混溶驱替试验,以确定阴离子溴化物和17个单核芳香烃(MAHs)的同源序列的传输参数。在每个测试中,单个示踪剂的连续输入脉冲在200 bar的限制压力下通过容纳在静水压芯支架中的圆柱芯。通过在线UV吸光度测得的废水浓度与时间的关系产生了平滑的高分辨率正弦穿透曲线(BTC)。与接近高斯溴化物的BTCs相比,MAHs的传输受到不同程度的延迟,沿着较快的流线的延迟传输量最小,而沿较慢的流线的传输量则逐渐增大。这些结果表明,尽管缺乏明显的水力非均质性,但在吸附位点之间仍存在高度的非均质性。使用一维流动模型对BTC进行适当建模,该模型包含瞬时平衡和速率限制的可逆吸附位点的混合物。瞬时部位的相对分数与主题MAH通过核心的速率成比例地增加。评估了MAHs的常见化学参数与其整体延迟因子,吸附系数和瞬时平衡分数之间的潜在定量结构保留关系(QSRR)。在所检查的化合物中,发现与分子量,水溶性,

更新日期:2020-09-14
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