In trace analysis, this is the unintentional introduction of analyte(s) or other species which are not present in the original sample and which may cause an error in the determination. It can occur at any stage in the analysis. Quality assurance procedures, such as analyses of blanks or of reference
materials, are used to check for contamination problems.

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

Arctic Mercury Cycling May Be Linked to Ice Cover | EVISA's News
ISPTS2018: 15th International Symposium on Persistent Toxic Substances | EVISA's Agenda of Events
Journals database: Critical Reviews in Environmental Science and Technology
SETAC Europe 26th Annual Meeting | EVISA's Agenda of Events
Instrument database: Mettler Toledo AG - Excellence Plus XP
Link database: Chemical Fact Sheet: Thorium
Link database: Blacksmith Institute: Mining and Ore Processing - Lead Pollution
Instrument database: Shawcity Ltd. - MVI - Mercury Vapour Indicator
Instrument database: Buck Scientific - BLC-10 Isocratic HPLC System
Arsenic species in rice: Origin, uptake and geographical variation | EVISA's News
Man made mercury pollution is reaching even deep ocean organisms | EVISA's News
Instrument database: Physical Electronics - TRIFT IV TOF-SIMS
Instrument database: Julabo Labortechnik GmbH - FC1600S Recirculating Cooler
CEST2017: 15th International Conference on Environmental Science and Technology | EVISA's Agenda of Events
Natural dissolved organic matter plays dual role in cycling of mercury | EVISA's News
Certified reference materials for mercury in marine animal tissues | EVISA's News
Material database: Institute of Nuclear Chemistry and Technology (INCT/ICHTJ) - INCT-TL-1 Tea Leaves
CCA-treated wood poses long-term threat | EVISA's News
Surprisingly high concentrations of toxic arsenic species found in U.S. rice | EVISA's News
ESI-MS: The tool for the identification of chemical species | EVISA's News