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: The Food and Environment Research Agency (FAPAS) - Test Material T07157 (Tomato Paste)
Instrument database: Thermo Scientific - TSQ Quantum XLS Ultra™ GC-MS/MS
Material database: QUASIMEME - Diphenyltin-pentyl
Link database: GreenFacts: Alzheimer, cancer : scientific assessments on health risks from aluminium exposure in food and dermatology products.
Material database: IRMM - Institute for Reference Materials and Measurements - BCR-667 - Estuarine Sediment
Link database: Government of British Columbia: Ministry of Environment: Ambient Water Quality Guidelines for Zinc
Material database: Food Analysis Performance Assessment Scheme (FAPAS) - Test Material T07153 (Canned Fish)
Instrument database: Dionex Corporation - RF 2000 Fluorescence Detector
Instrument database: GBC Scientific Equipment Ltd. - INTEGRA XP - Simultaneous ICP-OES Spectrometer
Scientific publications with participation of EVISA | EVISA's News
Instrument database: Spectrolab Analytical - Total Hydrocarbon Analyser Type 404
Journals database: Minerals engineering
Material database: RECIPE Chemicals + Instruments GmbH - ClinChek 8883 Control blood plasma, lyophilised, trace elements level I
Material database: National Institute of Standards and Technology (NIST) - SRM 50c - Tungsten-Chromium-Vanadium Steel
Application of Mass Spectrometry to Speciation Analysis in the Life Sciences | EVISA's Agenda of Events
Mercury levels in Pacific yellowfin tuna increasing | EVISA's News
Arsenic exposure from Poultry Meat produced in the US before 2015 | EVISA's News
Material database: IAEA - MEL International Atomic Energy Agency - IAEA-452 , Biota, Scallop (Pecten maximus)
New light on human selenium metabolism | EVISA's News
Link database: US FDA: Elemental Analysis Manual: Section 4.8: HPLC-ICP-MS Determination of Methylmercury and Total Mercury in Seafood