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:

EU’s proposal to restrict Cr (VI) in leather in final stages | EVISA's News
CRMs for the speciation analysis of chromium in environmental materials | EVISA's News
Material database: Canadian Certified Reference Materials Project (CCRMP) - CUAR-1 Copper Anode
Link database: Metals and Neurodegeneration
Instrument database: Analytik Jena AG - multi N/C® pharma
Link database: Chemical Transformations of Chromium in Soils: Relevance to Mobility, Bio-availability and Remediation
Link database: Chemical Fact Sheet: Ruthenium
Mercury 'speciation analysis' by using thermal desorption analysis | EVISA's News
Hexavalent chromium found in bread | EVISA's News
Elusive Hg(IV) species has been synthesized under cryogenic conditions | EVISA's News
Speciation matters even if the interest is in total element concentration | EVISA's News
CEST 2019: 16th International Conference on Environmental Science and Technology | EVISA's Agenda of Events
Company database: Linn High Term GmbH
Link database: The accumulation, distribution, and elimination of dietary arsenobetaine in Atlantic salmon and Atlantic cod,
Manganese concentrations in air particulates higher in residential neighborhoods than industrial sites, varies by region | EVISA's News
Instrument database: LAR Process Analysers AG - QuickTOC®loop
Chemical speciation as a discipline in Analytical Chemistry – Definitions
Instrument database: Analytik Jena AG - multi N/C® UV HS
Link database: Chemical Fact Sheet: Gadolinium
Instrument database: Claisse, Inc - The Bee-Electric Fluxer