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:

Link database: NEMI: Method Number: 321.8: Bromate by IC/ICP-MS
Arsenic species in rice: A new Australian reference material | EVISA's News
Instrument database: Bruker Daltonics - micrOTOF-Q
Instrument database: Edax Inc. - Eagle III ÁProbe
Instrument database: Biochrom Ltd. - Libra S21 Visible Spectrophotometer
Instrument database: Varian Inc. - 500-MS LC Ion Trap
Material database: ISC Science - 123Sb Spike Solution
Link database: Selenium and Livestock: Metabolism, Toxicity and Deficiency
Material database: IRMM - Institute for Reference Materials and Measurements - ERM-CD281 - Rye Grass
Side effects of cisplatin chemotherpy: Platinum speciation matters | EVISA's News
Error sources in speciation analysis - Overview | EVISA's News
Material database: National Institute of Standards and Technology (NIST) - SRM 612 - Trace Elements in Glass
Instrument database: Buck Scientific - 410 Cold Vapour Mercury Analyzer
Company database: Nippon Instruments Corporation
Instrument database: B─HR-Thermoanalyse GmbH - Simultaneous Thermal Analyzer STA 503
Material database: National Metrology Institute of Japan (NMIJ) - NMIJ CRM 7402-a Trace Elements, Arsenobetaine and Methylmercury in Cod Fish Tissue
Material database: Food Analysis Performance Assessment Scheme (FAPAS) - Test Material T07160 (Canned Crab Meat)
Material database: National Research Council of Canada (NRC - CNRC) - VITA-1 - Low-level Multivitamin Certified Reference Material for Minerals and Vitamins
Material database: RECIPE Chemicals + Instruments GmbH - ClinChek 8848 Urine Control lyophilised / trace elements level II
New insights on arsenic cycling | EVISA's News