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:

Transformation of arsenic species during ultrasonic sample pretreatment | EVISA's News
Journals database: Journal of Environmental Chemical Engineering
Link database: Chemical Transformations of Chromium in Soils: Relevance to Mobility, Bio-availability and Remediation
Goldschmidt 2019 conference session: Trace Elements Speciation: Novel Methodologies and Insights into Transformations Influencing their Global Biogeochemical Cycle | EVISA's Agenda of Events
Material database: IRMM - Institute for Reference Materials and Measurements - BCR-182 - Steam coal
Speciation vs Fractionation | EVISA's News
Highly selective Cr(VI) determination at ultra-trace levels using on-line trapping of Cr(III) with ICP-MS detection | EVISA's News
Agilent Technologies publishes Handbook of Hyphenated ICP-MS Applications | EVISA's News
Researchers found new sulfur-containing metabolites in the urine of rats exposed to arsenite | EVISA's News
Instrument database: Analytik Jena GmbH - multi N/CŪ UV HS
Chromium (III) - not only therapeutic? | EVISA's News
Directory of scientists: Marc Amyot
Effect of cooking on the speciation of chromium in food | EVISA's News
Determination of Thallium Speciation in Water Samples by HPLC-ICP-MS | EVISA's News
Link database: USGS: Statistics and Information: Platinum Group Metals
Link database: Lenntech: Chromium (Cr) and water
Speciomics as a concept involving chemical speciation and omics | EVISA's News
Speciation and Toxicity | EVISA's News
Isotopic measurements and speciation analysis | EVISA's News
Instrument database: Analytik Jena AG - multi N/CŪ pharma