Any one of a group of three quantities characterizing the composition of a mixture and defined as one of mass, amount of substance (chemical amount), or number divided by volume, giving, respectively, mass, amount (of substance), or number concentrations.

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

Material database: JRC - Joint Research Centre - BCR-113 - Potassium Chloride Fertilizer
Material database: JRC - Joint Research Centre - BCR-129 - Hay Powder
Decreased risk of colorectal cancer linked with higher selenium status | EVISA's News
Material database: SUPELCO by Sigma-Aldrich - Chromium(III) atomic absorption standard solution
Instrument database: Metrohm AG - MIC-1 Advanced IC System
Link database: European Directive: European Parliament and Council Directive 94/62/EC of 20 December 1994 on packaging and packaging waste
Instrument database: Claisse, Inc - TheAnt
Toxic mine cleanup may get help from arsenic-loving bacteria | EVISA's News
Material database: The Food and Environment Research Agency (FAPAS) - Test Material T07113 (Fruit Juice)
Elemental speciation is going commercial | EVISA's News
Arsenolipids in fish oil found by arsenic speciation analysis | EVISA's News
New arsenic species found in electronic cigarettes | EVISA's News
Tribute to Jacques Buffle: founding father of dynamic metal speciation analysis | EVISA's News
Link database: US EPA Method 7195: Hexavalent chromium (coprecipitation)
Material database: RECIPE Chemicals + Instruments GmbH - ClinChek 8840 Whole blood, lyophilized, trace elements level I: LOT 445
New Agilent HPLC column for routine determination of arsenic species in human urine by HPLC-ICP-MS | EVISA's News
Arsenic species in rice: Origin, uptake and geographical variation | EVISA's News
Thermo Fisher Scientific Introduces Speciation Analysis Capabilities For High Resolution ICP-MS | EVISA's News
Link database: FDA: Arsenic in Pear Juice Analytical Results, 2005-2011
Instrument database: Postnova Analytics GmbH - AF2000 MT Mid Temperature aqueous/organic Asymmetric Flow FFF