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The follow definitions are used in the description of the cleanup technologies

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halogenated organic compoundA compound containing molecules of chlorine, bromine, iodine, and/or fluorine. Many herbicides, pesticides, and degreasing agents are made from halogenated organic compounds.
hazardous wasteDefined by federal and state law as exhibiting either of the following characteristics: ignitability, corrosivity, reactivity, or toxicity
heavy metalA reference to a group of metals including arsenic, chromium, copper, lead, mercury, silver, and zinc
Henry's LawHenry's Law is a measure of the extent that a chemical separates between water and air. The higher the Henry's Law constant, the more likely substances will volatize rather than remaining in water.
herbicideA chemical pesticide designed to control or destroy plants, weeds, or grasses.
heterogeneousNon-uniform in grain size, structure, or composition.
HMXHis Majesty's Explosive ((octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine).
homogeneousUniform in grain size and structure.
hydraulic headHead is the energy of a body of water produced by elevation, at a given pressure and temperature. It is a measure of potential energy of a body of water.
hydrazineA toxic liquid used in rocket propellant, agricultural chemicals, antioxidants, and explosives.
hydrocarbonAn organic compound containing only hydrogen and carbon, often occurring in petroleum, natural gas, and coal.
hydrogen sulfideA gas emitted during decomposition of organic compounds. It also is a byproduct of oil refining and burning.
hydrogeologyThe study of groundwater, including its origin, occurrence, movement, and quality.
hydrologyThe scientific study of the properties, distribution, and effects of water in the atmosphere, on the earth's surface, and in soil and rocks.

Note: A majority of the terms and definitions are based on the U.S. Environmental Protection Agency's Brownfields Innovative Technology Glossary . Some definitions have been modified/enhanced to support the Tech Tree text.

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This page was last updated OCTOBER 26, 1998
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