+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Influence of air-water interfacial adsorption and gas-phase partitioning on the transport of organic chemicals in unsaturated porous media



Influence of air-water interfacial adsorption and gas-phase partitioning on the transport of organic chemicals in unsaturated porous media



Environmental Science and Technology 32(9): 1253-1259



We investigated in laboratory column experiments, the aqueous-phase transport of four n-alcohols (n-hexanol-n-nonanol), three chlorinated aromatic compounds (chlorobenzene, o-dichlorobenzene, and o-chlorophenol), and two alkylbenzenes (ethylbenzene and p-xylene) in a water-unsaturated porous medium (sand). The influence of gas-phase partitioning and interfacial adsorption on solute retardation during steady unsaturated water flow was evaluated over a range of water contents. Air-water interfacial adsorption was a significant factor for the retardation of n-alcohols. For example, nearly 90% of the measured retardation of n-nonanol could be attributed to interfacial adsorption at a water saturation of 34%. Aromatic compounds used in this study were not significantly affected by adsorption at the air-water interface because of both low air-water interfacial area (0-50 cm2/cm3) generated in the unsaturated porous medium and the small interfacial-adsorption coefficients. Instead, gas-phase partitioning was the primary mechanism responsible for the measured retardation of most of the aromatic compounds evaluated in this study. Using the batch-measured interfacial adsorption coefficients for n-octanol and n-nonanol and the column-measured retardation factors, the effective air-water interfacial areas were estimated. These values agreed closely with those we reported earlier, based on displacement experiments with an anionic surfactant as an interfacial tracer. Copyright 1998, American Chemical Society.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 003173887

Download citation: RISBibTeXText

DOI: 10.1021/es970868y


Related references

Gaseous transport of volatile organic chemicals in unsaturated porous media: effect of water-partitioning and air-water interfacial adsorption. Environmental Science and Technology 35(22): 4457-4462, 2001

Characterizing gas-water interfacial and bulk-water partitioning for gas-phase transport of organic contamination in unsaturated porous media. Environmental Science and Technology, ES and T 31(6): 1645-1649, 1997

Characterizing gas-water interfacial and bulk-water partitioning for gas-phase transport of organic contaminants in unsaturated porous media. Environmental Science and Technology 31(6): 1645-1649, 1997

Adsorption of natural organic matter to air-water interfaces during transport through unsaturated porous media. Environmental Science & Technology 38(1): 120-126, 2004

Density and pressure effects on the transport of gas phase chemicals in unsaturated porous media. Water Resources Research 39(3): SBH 8/1-SBH 8/11, 2003

Effect of colloids on volatile contaminant transport and air-water partitioning in unsaturated porous media. Water Resources Research 33(11): 2447-2457, 1997

Transport and fate of volatile organic chemicals in unsaturated, nonisothermal, salty porous media: 1. Theoretical development. Journal of Hazardous Materials 69(2): 151-167, 1999

Adsorption of PFOA at the Air-Water Interface during Transport in Unsaturated Porous Media. Environmental Science and Technology 52(14): 7745-7753, 2018

Transport and fate of volatile organic chemicals in unsaturated, nonisothermal, salty porous media: 2. Experimental and numerical studies for benzene. Journal of Hazardous Materials 69(2): 169-185, 1999

Transient multicomponent gas-phase transport of volatile organic chemicals in porous media. Journal of Environmental Quality 25(5): 1041-1047, 1996

Influence of the Gas-Water Interface on Transport of Microorganisms through Unsaturated Porous Media. Applied and Environmental Microbiology 60(2): 509-516, 1994

Tortuosity of immiscible fluids in porous media based on phase interfacial areas; a new definition and its application to Hanford's unsaturated media. Abstracts with Programs - Geological Society of America 35(6): 482, 2003

Transport behavior of volatile organic compounds in unsaturated porous media under wetting and drying conditions for different water contents. Eos, Transactions, American Geophysical Union 77(46, Suppl, 1996

Novel methods for measuring air-water interfacial area in unsaturated porous media. Chemosphere 127: 208-213, 2015

Contaminant transport with adsorption process in saturated-unsaturated porous media. Eos, Transactions, American Geophysical Union 62(17): 287, 1981