Light nonaqueous-phase liquids

Fig. 4.7 Simplified conceptual model for Light nonaqueous phase liquid (LNAPL) release and migration. Reprinted from Mercer JW, Cohen RM (1990) A review of immiscible fluids in the subsurface Properties, models, characterization, and remediation. J Contam Hydrol 6 107-163. Copyright 1990 with permission of Elsevier...

Holman H-YN, Javan del I (1996) Evaluation of transient dissolution of slightly water-soluble compounds from a light nonaqueous phase liquid pool. Water Resour Res 32 915-923... 

The contaminant s aqueous solubility and density greatly influence its final disposition in water-solid systems. Dense nonaqueous phase liquids (DNAPLs) are chemicals with densities greater than water and typically low aqueous solubilities. DNAPLs naturally partition away from the aqueous phase and towards the solid phase, often pooling on top of an impermeable solid layer. On the other hand, light nonaqueous phase liquids (LNAPLs) possess densities less than water and have a tendency to pool on the water s surface where they may be prone to volatilization and photolysis reactions. Various liquid-solid partition coefficients have been... 

Nonaqueous-Phase Liquid. (NAPL) Any liquid other than water. In environmental fields the term commonly refers to hydrocarbon liquids less dense than water (light nonaqueous-phase liquid, LNAPL), or chlorinated hydrocarbons that are more dense than water (dense nonaqueous-phase liquid, DNAPL). Example 1,1,1-trichloroethane is a DNAPL. 

Sources Adapted from Mercer, J.W. and Cohen, R.M. 1990. Journal of Contamirumt Hydrology, 6 107-163 HuUng, S.G. and Weaver, J.W. 1991. Dense nonaqueous phase liquids. Ground Water Issue, EPA/540/4-91/002, R.S. Kerr Environmental Research Laboratory, USEPA, Ada, OK Newell, C.J., et al. 1995. Light nonaqueous phase liquids. Ground Water Issue, EPA 540/S-95/500, R.S. Kerr Environmental Research Laboratory, USEPA, Ada, OK Sharma, H.D. and Reddy, K.R. 2004. Geoenvironmental Engineering, WUey, Hoboken, NJ, 108 pp. 

Newell, C. J., S. D. Acree, R. R. Ross, and S. G. Huling. 1995. Light nonaqueous phase liquids. Ground Water Issue, EPA 540/S-95/500, R.S. Kerr Enviroiunental Research Laboratory, USEPA, Ada, OK. 

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