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1. fourth in order. 2. containing four elements or groups. quaternary. 1 adj, pertaining to a chemical compound in which four atoms or groups of elements are bonded to one atom, such as a quaternary ammonium compound in which four organic radicals are substituted for the four hydrogen molecules on an ammonium ion.
Quaternary ammonium compounds are cationic detergents, as well as disinfectants, and as such can be used to remove organic material. They are very effective in combination with phenols. Quaternary ammonium compounds are deactivated by anionic detergents (including common soaps).n di-quaternary ammonium compounds, this process can also result in the formation of fragment ions with higher mass as compared to their precursor ion.