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 is converted to oxidized species in the upper atmosphere facilitating its entrance into the food chain | EVISA's News
Toxic mine cleanup may get help from arsenic-loving bacteria | EVISA's News
Atomic Fluorescence Spectrometry as a Detection System for Speciation Analysis | EVISA's News
Instrument database: Shimadzu Europe - TOC-V CSH/CSN/CPH/CPN
Species of interest
Gut bacteria transform inorganic arsenate leading to more toxic arsenic species | EVISA's News
Link database: ITRI: Tin Catalysts
Antimony mine disaster | EVISA's News
Link database: Chemical Transformations of Chromium in Soils: Relevance to Mobility, Bio-availability and Remediation
Link database: Hong Kong: Open Laboratory of Chemical Biology: C.-M. Che (HKU)
HPLC-ICPMS/MS as a versatile tool for the speciation of non-metals: Sulfur species in wine | EVISA's News
Arsenic concentration in groundwater may be affected by bacteria | EVISA's News
Journals database: Corrosion Science
Journals database: Journal of Environmental Chemical Engineering
Link database: Chemical Fact Sheet: Cobalt
Link database: The accumulation, distribution, and elimination of dietary arsenobetaine in Atlantic salmon and Atlantic cod,
Link database: Chemical Fact Sheet: Strontium
Bacterial methylation of mercury not only starting from oxidized mercury | EVISA's News
Material database: Canadian Certified Reference Materials Project (CCRMP) - CCU-1c Copper Concentrate
Link database: US EPA Method 1631: rev.e - Mercury in water by oxidation , purge and trap and CVAFS