A chemical reaction in which a compound or radical loses electrons, that is in which the positive valence is increased.

The term "oxidation" was found in the following pages:

Mercury 'speciation analysis' by using thermal desorption analysis | EVISA's News
Material database: Canadian Certified Reference Materials Project (CCRMP) - INM-1: Pyrometallurgical Material for Sulphur
Instrument database: Shimadzu Europe - TNM-1 Total Nitrogen Module
Link database: Toxipedia: Magnesium
The Determination of Hexavalent Chromium in Airborne Particulate Matter in Presence of High Amounts of Trivalent Chromium | EVISA's News
Toxic mine cleanup may get help from arsenic-loving bacteria | EVISA's News
Link database: The accumulation, distribution, and elimination of dietary arsenobetaine in Atlantic salmon and Atlantic cod,
Company database: Linn High Term GmbH
Highly selective Cr(VI) determination at ultra-trace levels using on-line trapping of Cr(III) with ICP-MS detection | EVISA's News
Preservation of arsenic speciation in natural water samples for up to three months | EVISA's News
Instrument database: Analytik Jena GmbH - multi N/CŪ pharma
Instrument database: PerkinElmer Inc. - Diamond TG/DTA
Arsenic species distribution in drinking water wells in the USA with high arsenic concentrations | EVISA's News
Link database: US EPA Method 1631 appendix: Total mercury in tissue, sludge, sediment and soil by acid digestion and BrCl oxidation
Material database: SUPELCO by Sigma-Aldrich - Chromium(III) oxide
Link database: Hexavalent Chromium Dangers
Instrument database: Analytik Jena AG - multi N/CŪ pharma
Researchers discover how selenium is incorporated into proteins | EVISA's News
Instrument database: Analytik Jena GmbH - multi N/C 3100
Species of interest