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Non-aqueous phase liquid
Non-aqueous phase liquids or NAPLs are liquid solution contaminants that do not dissolve in or easily mix with the water. like oil, gasoline and petroleum products.〔National Research Council, 1994〕
NAPLs tend to contaminate soil and ground waters. Many common ground water contaminants such as chlorinated solvents and many petroleum products enter the subsurface in nonaqueous-phase solutions.〔National Research Council, 1993〕 They do not mix readily with water and therefore flow separately from ground water.〔National Research Council, 1997〕
If the NAPL is denser than water, like trichloroethylene, it is called DNAPL and will tend to sink once it reaches the water table. If it is lighter, like gasoline, it is called LNAPL and will tend to float on the water table. 〔National Research Council, 1997〕 LNAPL penetrates below the water table like ice cubes in a glass of water. 〔Interstate Regulatory Technology Council, 2015〕
== Notes ==
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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