anion

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anion

(ăn`ī'ən), atom or group of atoms carrying a negative charge. The charge results because there are more electrons than protons in the anion. Anions can be formed from nonmetals by reduction (see oxidation and reductionoxidation and reduction,
complementary chemical reactions characterized by the loss or gain, respectively, of one or more electrons by an atom or molecule. Originally the term oxidation
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) or from neutral acids (see acids and basesacids and bases,
two related classes of chemicals; the members of each class have a number of common properties when dissolved in a solvent, usually water. Properties
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) or polar compounds by ionization. Anionic species include Cl, SO4−−, and CH3COO. Highly colored intermediates in organic reactions are often radical anions (anions containing an unpaired electron). Saltssalt,
chemical compound (other than water) formed by a chemical reaction between an acid and a base (see acids and bases). Characteristics and Classification of Salts

The most familiar salt is sodium chloride, the principal component of common table salt.
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 are made up of anions and cationscation
, atom or group of atoms carrying a positive charge. The charge results because there are more protons than electrons in the cation. Cations can be formed from a metal by oxidation (see oxidation and reduction), from a neutral base (see acids and bases) by protonation, or
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. See ionion,
atom or group of atoms having a net electric charge. Positive and Negative Electric Charges

A neutral atom or group of atoms becomes an ion by gaining or losing one or more electrons or protons.
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.

anion

[′a‚nī·ən]
(chemistry)
An ion that is negatively charged.

anion

a negatively charged ion; an ion that is attracted to the anode during electrolysis
References in periodicals archive ?
Modified palatability of commercial products or higher herd dry matter intake or lesser inclusion level of anionic salt would be the outcome for unaffected feed intake (Hutjens, 1991; Oetzel et al.
1] were selected for anionic, cationic, and non-ionic PAM, respectively.
15,16) Extensive reactivity ratio data of acrylamide with cationic and anionic monomers under various conditions are summarized elsewhere.
Figure 1 shows comparison of the morphology of PPy prepared in the presence of anionic surfactant.
In their latest paper, published in Food Chemistry, Bazinet and his colleagues describe how the new system allowed them to simultaneously digest a large protein--[beta]-1actoglobulin, the main component of whey protein--and extract both cationic and anionic peptides from it, including some with activity against high cholesterol and blood pressure.
For clays modified with zwitterion, nonionic and anionic surfactants (TMG, HEC, TRITON X-100, LABSA and SLES), it was seen that the liquid limit and plasticity index increased when surfactant percentage was increased.
They indicated that PSS-794 has a notable ability to selectively target anionic cells in living animals.
For many years now analysis of the anionic surfactants have been analysed using the Epton titration and this method has an accredited method noteably ISO 2271
Recently, Overton (2005) described modified diet formulations considered suitable for cows given a 40-d dry period when managed in one or two nutritional groups throughout the dry period and whether or not anionic salts are added to the diet.
The surfactants can be discharged from wastewater treatment plants (WWTP) and from the sewage sludge used as a fertilizer in the agriculture, because anionic surfactants can accumulate in the sewage sludge [7-9].
4) Polylysine-condensed DNA entrapped into folate-targeted anionic liposomes have been successfully used for tumor cell-specific gene transfer.
Silica nanoparticle technology systems and anionic trash collectors (ATCs) improve productivity and properties across all grades," he said.