In environmental chemistry the term is in some cases virtually equivalent to pollutionwhere the main interest is the harm done on a large scale to humans or to organisms or environments that are important to humans.
The term radioactive contamination may have a connotation that is not intended. For other uses, see Contamination disambiguation. In cases where the contaminant is a living microorganismit can often multiply and take over the experiment, especially cultures, and render them useless.
If the additional reactions are detrimental, other terms are often applied such as toxinpoison or pollutantdepending on the type of molecule involved. Contamination may be recognized or not and may become an issue if the impure chemical is mixed with other chemicals or mixtures and causes additional chemical reactions.
A major fraction of chemistry is involved with identifying, isolating, and studying contaminants. All chemicals contain some level of impurity. Contamination is the presence of an unwanted constituent, contaminant or impurity in a material, physical bodynatural environmentworkplaceetc.
In geology and especially geochemistryit can have similar effects where even a few grains of "modern" dust can distort results of sophisticated experiments. In food chemistry and medicinal chemistrythe term "contamination" is used to describe harmful intrusions, such as the presence of toxins or pathogens in food or pharmaceutical drugssee food contaminant.
The term refers only to the presence of radioactivityand gives no indication of the magnitude of the hazard involved. Contamination may include residual radioactive material remaining at a site after the completion of decommissioning of a site where there was a nuclear reactorsuch as a power plantexperimental reactorisotope reactor or a nuclear powered ship or submarine.
In radiation protection the radioactive contamination is radioactive substances on surfaces, or within solids, liquids or gases including the human bodywhere their presence is unintended or undesirable, or the process giving rise to their presence in such places.
Sciences[ edit ] "Contamination" has also more specific meanings in science: Contaminants are biological, chemical, physical or radiological substance. In forensic sciencea contaminant can be fingerprintshairskin or DNA from first responders or from sources not related to the ongoing investigation, such as family members or friends of the victim who are not suspects.
In chemistrythe term usually describes a single constituent, but in specialized fields the term can also mean chemical mixtures, even up to the level of cellular materials.Hands are one of the major sources and routes for cross-contamination in the food industry and Campden BRI's step-by-step instructional video details how food manufacturers, operatives and those involved in food preparation and handling can minimise the risk of cross-contamination.
Contamination definition, the act of contaminating, or of making something impure or unsuitable by contact with something unclean, bad, etc.
See more. Contamination | Define Contamination at mint-body.com cross contamination Medical practice The passsage of pathogens indirectly from one Pt to another due to use of improper sterilization procedures.
Cross contamination definition is - inadvertent transfer of bacteria or other contaminants from one surface, substance, etc., to another especially because of unsanitary handling procedures. How to use cross contamination in a sentence.
Definition of cross-contamination: Indirect bacterial contamination (infection) of food, caused by contact with an infected raw food or non-food source such as clothes, cutting boards, knives. Also called cross-infection. Cross contamination is a fancy name for when bacteria on a kitchen tool transfers to food via direct contact.
In the culinary arts, two of the most common kitchen tools usually tend to be a knife or a cutting board.Download