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anion

1. n. [Drilling Fluids]

A negatively charged ion. Clay surfaces, groups on polymer chains, colloids, and other materials have distinct, negatively charged areas or ions. Anionic characteristics affect performance of additives and contaminants in drilling fluids, especially water muds, in which clays and polymers are used extensively.

Synonyms: anionicwater mud

Antonyms: cation

See: acrylate polymercalcium contaminationcarbonate ioncation exchange capacityclaycolloidmixed-metal hydroxidepolar compoundpotassium ion

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