Abstract The presence of water-immiscible organic liquids—commonly called non-aqueous phase liquids or NAPLs—in soils and groundwater, is a worldwide environmental problem. Typical examples NAPLs include: petroleum products, solvents liquid waste from laboratories industry. molecular components present in soils, rocks groundwater are readily transferred to the vapour aqueous phases. extent whic...

Dear Editor Over the past decade, there has been an increase in studies of individuals at clinical high risk (CHR) of developing psychosis characterized by subthreshold psychotic symptoms and functional decline before the emergence of a diagnosable psychotic disorder. Typically, this research focuses on an improved understanding of the prodromal period, the predictors of developing psychosis as...

liquid contamination of the subsurface. That article was among the first to model the infiltration of organic solvents into aquifer systems. Before the mid-1980s, the importance of separate phase liquid pollutants was not appreciated, and most investigations into groundwater contamination had focused on solute (dissolved constituent) transport. Since that time, substantial resources have been d...

An adaptive moving mesh method is presented for numerical simulation of two dimensional groundwater flow and transport problems. A selection of problems are considered, including advection dominated chemical transport and reaction, solute transport from contamination sources, transport of nonaqueous phase liquids (NAPLs) in an aquifer, and coupling of groundwater flow with NAPL transport. Numer...

Accurate estimation of the non-aqueous phase liquids (NAPLs) saturation such as chlorinated organic compounds (COCs) in aquifers is crucial for proper remediation contaminated groundwater. A combination conservative and partitioning tracers (PTs) are commonly used to assess NAPL saturations subsurface at COC release sites, using interwell tracer test (PITT). In this study, five fluorescent dyes...

Organic liquids are common polluters of the subsurface environment. Once released, these nonaqueous phase liquids (NAPLs) tend to become entrapped within soils and geologic formations where they may serve as long-term contaminant reservoirs. The interphase mass transfer from such entrapped residuals will ultimately control environmental exposure levels as well as the persistence and/or remedial...

Nonaqueous phase liquid (NAPL) contaminants that are chemical mixtures often contain compounds that are solids in their pure states. In the environment, weathering processes cause shifts in multicomponent NAPL composition, thereby enriching the NAPL in the less soluble compounds which may result in their eventual solidification. In this paper, we review the thermodynamic theory governing solid–...