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:

Link database: EPA Method 3060A: Alkaline Digestion for Hexavalent Chromium
Gut bacteria transform inorganic arsenate leading to more toxic arsenic species | EVISA's News
Thermo Fisher Scientific Introduces Speciation Analysis Capabilities For High Resolution ICP-MS | EVISA's News
Microbeam analysis of dental amalgam reveals high mobility of mercury | EVISA's News
Arsenic speciation analysis for water samples: How long can samples be stored ? | EVISA's News
Instrument database: Shimadzu Europe - TNM-1 Total Nitrogen Module
Journals database: Solid State Ionics
Speciation and Toxicity | EVISA's News
Elusive Hg(IV) species has been synthesized under cryogenic conditions | EVISA's News
Instrument database: Seiko Instruments Inc. - EXSTAR6000 DSC Differential Scanning Calorimeter
Material database: IRMM - Institute for Reference Materials and Measurements - BCR-182 - Steam coal
Link database: Chemical Fact Sheet: Neptunium
Link database: Lenntech: Chromium (Cr) and water
Goldschmidt 2019 conference session: Trace Elements Speciation: Novel Methodologies and Insights into Transformations Influencing their Global Biogeochemical Cycle | EVISA's Agenda of Events
Journals database: Journal of Hazardous Materials
Company database: Linn High Term GmbH
Instrument database: LAR Process Analysers AG - Elox100 COD Analyzer
Speciation matters even if the interest is in total element concentration | EVISA's News
Mercury is converted to oxidized species in the upper atmosphere facilitating its entrance into the food chain | EVISA's News
Chromium Isotope Ratio as a Tool to Track the Redox State of the Earth | EVISA's News