Jeong Seung-Woo, Wood A Lynn, Lee Tony R
Office of Research and Development, US Environmental Protection Agency, 919 Kerr Research Drive, P O Box 1198, Ada, OK 74820, USA.
J Hazard Mater. 2002 Nov 11;95(1-2):125-35. doi: 10.1016/s0304-3894(02)00088-2.
Hydrophobic dyes have been used to visually distinguish dense non-aqueous phase liquid (DNAPL) contaminants from background aqueous phases and soils. The objective of this study was to evaluate the effects of a dyed DNAPL, 0.5 g Oil-Red-O/l of PCE, on the physical properties of remedial solutions: water, co-solvents (50, 70, and 90% (v/v) ethanol), and surfactants (4% (w) sodium dihexyl sulfosuccinate). This study compared the densities, viscosities, and interfacial tensions (IFTs) of the remedial solutions in contact with both dyed and undyed PCE. The presence of the dye in PCE substantially alters the IFTs of water and ethanol solutions, while there is no apparent difference in IFTs of surfactant solutions. The remedial solutions saturated with PCE showed higher viscosities and densities than pure remedial solutions. Solutions with high ethanol content exhibited the largest increases in liquid density. Because physical properties affect the flow of the remedial solutions in porous media, experiments using dyed DNAPLs should assess the influence of dyes on fluid and interfacial properties prior to remediation process analysis.
疏水性染料已被用于从背景水相和土壤中直观区分致密非水相液体（DNAPL）污染物。本研究的目的是评估一种染色的DNAPL（0.5克油红O/升的四氯乙烯）对修复溶液物理性质的影响，这些修复溶液包括水、助溶剂（50%、70%和90%（v/v）乙醇）以及表面活性剂（4%（w）二己基磺基琥珀酸钠）。本研究比较了与染色和未染色的四氯乙烯接触的修复溶液的密度、粘度和界面张力（IFT）。四氯乙烯中染料的存在显著改变了水和乙醇溶液的界面张力，而表面活性剂溶液的界面张力没有明显差异。被四氯乙烯饱和的修复溶液比纯修复溶液表现出更高的粘度和密度。乙醇含量高的溶液液体密度增加最大。由于物理性质会影响修复溶液在多孔介质中的流动，因此在进行修复过程分析之前，使用染色DNAPL的实验应评估染料对流体和界面性质的影响。
