Subsurface interactions of humic substances with Cu(II) in saturated media

Article Abstract:

Column experiments can be a useful way of studying the links between natural organic matter (NOM) and Cu(II) while being transported through saturated media. At pH 6.2 and 7.5, atomic absorption spectroscopy was used to measure total Cu(II), with NOM being recorded as UV absorbance at 254 nm. A number of factors may have an effect on NOM and Cu(II) transport in groundwater, including Cu(II) bridging of NOM to mineral surfaces and NOM and the mineral surface competing for Cu(II) complexation. Results in various types of groundwater are discussed.

CHEMICALS AND ALLIED PRODUCTS, Research, Chemical reaction, Rate of, Chemical kinetics

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Vapor extraction of organics from subsurface soils: is it effective?

Article Abstract:

Vapor extraction is a technique for removing volatile organic compounds (VOCs) from the area of soil between the surface and groundwater. Introduced in 1984, the technique involves the drilling of injection wells, through which fresh air is released into the contaminated soil, and extraction wells, from which the VOCs are removed. By Aug 1991, 50 Superfund sites had implemented vapor extraction systems; all 50 have reported successful removal of 85-100% of contaminants within seven months to four years.

Evaluation, Soil disinfection

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Laboratory simulation of VOC entry into residence basements from soil gas

Article Abstract:

Volatile organic compounds (VOCs) are pollutants widely found in groundwater systems. VOCs in soil gas cause significant damages to homes, which they enter through fissures or cracks in the building's substructure. Experimental simulations show that VOCs from soil gas can enter residences through basements under negative pressure. The rate of VOC transport are influenced by soil permeability as well as soil porosity.

Gases, Water, Underground, Groundwater, Gas absorption, Gas adsorption

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