polyatomic ion

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polyatomic ion

[‚päl·ē·ə¦täm·ik ′ī·ən]
(chemistry)
An electrically charged species formed by covalent bonding of atoms of two or more different elements, usually nonmetals, for example, the ammonium ion (NH4+).
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Designed for use as background material by practitioners, this covers a range of topics from over 40 years of research, including current experimental methods for ion production and separation as well as those designed to reveal qualitative and quantitative aspect of gas-phased ions, theory and methods, tools for identifying the structure of gas-phase ions, what and what not to expect from gas-phase ions, ions containing C and polyatomic ions containing one to three C atoms, ion structures, ions containing only carbon atoms, and those containing one, two or three carbon atoms.
Therefore, ions with the same nominal mass as the analyte, resulting from singly charged ions, doubly charged ions, and polyatomic ions, cannot be resolved.
To eliminate the interferences effectively, the encountered polyatomic ions must be identified and the extent of these interferences must be assessed.
The polyatomic ions at mass 65, from S or Ca, do not result in significant interferences.
The S-containing polyatomic ions interfere at mass 64 and to a lesser extent at masses 66 and 67.
However, a precipitation method with nitric acid at room temperature to precipitate protein is preferred in our laboratory; this is important to minimize the occurrence of permanent blockage of the nebulizer, the torch, and the sampling orifice resulting from high concentrations of proteins, as well as to reduce polyatomic ion interferences such as [sup.