Retracted Article: Influence of aqueous sulfide on speciation of U(vi) adsorbed to nanomagnetite

We measure and model the concentration of separate phase hydrocarbons downgradient of a 19 year old aviation gasoline spill at the US Coast Guard Air Station in Traverse City, Michigan. The separate phase aviation gasoline is presumed to exist in mobile and residual partitions whose transport is modeled as a simple one dimensional balance of storage, advection, volatilization, and linear sorption. Field calibration suggests a retardation factor of 13.1, while volatilization accounts for about 30% of the originally spilled product, underscoring the importance of these two mechanisms in immiscible gasoline fate and transport studies.

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RETRACTED ARTICLE: Influence of different volume replacement strategies on inflammation and endothelial activation in the elderly undergoing major abdominal surgery

Intensive Care Medicine ◽

10.1007/s00134-003-2110-7 ◽

2004 ◽

Vol 30 (3) ◽

pp. 416-422 ◽

Cited By ~ 68

Author(s):

Joachim Boldt ◽

Michael Ducke ◽

Bernhard Kumle ◽

Michael Papsdorf ◽

Ernst-Ludwig Zurmeyer

Keyword(s):

Abdominal Surgery ◽

The Elderly ◽

Endothelial Activation ◽

Major Abdominal Surgery ◽

Volume Replacement ◽

Retracted Article ◽

Article Influence

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Fate and Transport of Organic Compounds in (to) the Subsurface Environment

Biophysico-Chemical Processes of Anthropogenic Organic Compounds in Environmental Systems ◽

10.1002/9780470944479.ch8 ◽

2011 ◽

pp. 215-231

Author(s):

Peter Grathwohl

Keyword(s):

Organic Compounds ◽

Fate And Transport ◽

Subsurface Environment

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The Fate and Transport of Hazardous Chemicals in the Subsurface Environment

Water Science & Technology ◽

10.2166/wst.1992.0025 ◽

1992 ◽

Vol 25 (1) ◽

pp. 169-176 ◽

Cited By ~ 8

Author(s):

Hossein Ganji Doust ◽

Ju-Chang Huang

Keyword(s):

Partition Coefficient ◽

Unsaturated Soils ◽

Fate And Transport ◽

Order Kinetic ◽

Solid Concentration ◽

Adsorption And Desorption ◽

Subsurface Environment ◽

Water Partition Coefficient ◽

Major Factors ◽

Time Required

Some volatile organic compounds (VOC's) such as 1,1,1-trichloroethane (TCA), trichloroethylene (TCE), and tetrachloroethylene (PCE) have been found as major groundwater pollutants which originate from the previous dump of these chemicals into unsealed ponds of landfill sites. One of the methods which has been proposed for cleaning these types of contaminants is to pump the groundwater out to the surface and then use air stripping to remove the VOC's. Knowledge of the fate and transport of these chemicals in the subsurface environment is necessary in predicting the time required for cleaning the groundwater. One of the major factors governing the transport and cleanup of VOC's in groundwater is the adsorption and desorption reactions of these compounds in the saturated and unsaturated soils. Thus, the objective of this study was to determine the rate and extent of adsorption and desorption of TCA, TCE. and PCE on clay and organic containing soils. The effects of solid concentration and sorbent characteristics were also investigated. It has been found that sorption and desorption are both very fast and reversible. The reactions fit well into the reversible pseudo first-order kinetic. The half time for the reversible adsorption is about 4 to 5 hrs, while that for desorption is around 15 hrs. The equilibrium adsorption follows the Henry's form of isotherm, or a simple partition model. The partition coefficients vary from .35 to 10 L/Kg at a test solid concentration of 40 g/L. When it is increased to 2700 g/L, the observed coefficients are reduced to only 5 to 50 percent. It has also been shown that for a sorbent having an organic fraction (foc) of 0.005 or greater, the partition coefficient, K, can be predicted from the following two models developed from this study:where Kow is the octanol-water partition coefficient and S is the solubility of VOC in mg/L.

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