| ignitable | That which can create fires under certain conditions. Examples of ignitable wastes include liquids, such as solvents that readily catch fire. |
| immunoassay | A technology used to measure biological reactions to individual compounds or classes of compounds. See technology description of Immunoassay. |
| impermeable | Not capable of spreading or diffusing through the openings or interstices of a medium. |
| in-situ | In its original place, unexcavated, or unmoved |
| incineration | A treatment technology that involves the burning of certain types of solid, liquid, or gaseous materials under controlled conditions to destroy hazardous waste. See technology description of Incineration. |
| information repository | A location in a public building that is convenient for local residents, such as a public school, city hall, or library, that contains information about a Superfund site, including technical reports and reference documents. |
| infrared monitor | A device used to monitor the heat signature of an object. It may be used to detect buried objects in soil. |
| innovative technology | A process that has been tested and used as a treatment for hazardous waste or other contaminated materials, but lacks a long history of full-scale use and information about its cost and how well it works sufficient to support prediction of its performance under a variety of operating conditions. |
| inorganic compound | A compound that generally does not contain carbon atoms, although carbonate and bicarbonate compounds are notable exceptions. Examples of inorganic compounds include various acids, potassium hydroxide, and metals. |
| institutional controls | A legal or institutional measure which subjects a property owner to limit activities at or access to a particular property. Fences, posting or warning signs, and zoning and deed restrictions are examples of institutional controls. |
| ion exchange | A treatment method used to remove and exchange ions from water. See technology description of Ion Exchange. |
| ion | An atom, group of atoms, or molecule that has gained or lost electrons, thus causing the atom to become either positively or negatively charged. |
| isotope | One of two or more atoms of the same element that have the same number of protons but different number of neutrons. For example, hydrogen has 1 proton, no neutrons; deuterium has 1 proton, 1 neutron; tritium has 1 proton, two neutrons. They are all isotopes of hydrogen. |
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