Anion 04 : A negatively charged atom or radical, such as Cl-, OH-, etc. in solution of an electrolyte. Anions move toward the anode (positive electrode) under the influence of an electrical potential. (Bul D11)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}