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- Unresolved_complex_mixture abstract "Unresolved complex mixture (also UCM or hump) is a feature frequently observed in gas chromatographic (GC) data of crude oils and extracts from organisms exposed to oil.The reason for the UCM hump appearance is that GC cannot resolve and identify a significant part of the hydrocarbons in crude oils. The resolved components appear as peaks while the UCM appears as a large background/platform. In non-biodegraded oils the UCM may comprise less than 50% of the total area of the chromatogram, while in biodegraded oils this figure can rise to over 90%. UCMs are also observed in certain refined fractions such as lubricating oils and references therein.One reason why it is important to study the nature of UCMs is that some have been shown to contain toxic components, but only a small range of known petrogenic toxicants, such as the USEPA list of 16 polycyclic aromatic hydrocarbons (PAHs), tend to be routinely monitored in the environment. Analysis of the hydrocarbon fraction of crude oils by gas chromatography (GC) reveals a complex mixture containing many thousands of individual components. Components that are resolved by GC have been extensively studied e.g. However, despite the application of many analytical techniques the remaining components have, until very recently, proved difficult to separate due to the large numbers of co-eluting compounds. Gas chromatograms of mature oils have prominent n-alkane peaks which distract attention from the underlying unresolved complex mixture (UCM) of hydrocarbons often referred to as the ‘hump’. Processes such as weathering and biodegradation result in a relative enrichment of the UCM component by removal of resolved components and the creation of new compounds. It has been shown that both resolved and unresolved components of oils are subject to concurrent biodegradation, i.e. it is not a sequential process, but due to the recalcitrant nature of some components, the rates of biodegradation of individual compounds greatly varies. The UCM fraction often represents the major component of hydrocarbons within hydrocarbon-polluted sediments (see reference therein) and biota e.g. A number of studies has now demonstrated that aqueous exposure to components within the UCM can affect the health of marine organisms, including possible hormonal disruption, and high concentrations of environmental UCMs have been strongly implicated with impaired health in wild populations.".
- Unresolved_complex_mixture thumbnail NonBiodegradedAndBiodegraded.png?width=300.
- Unresolved_complex_mixture wikiPageExternalLink pegg.
- Unresolved_complex_mixture wikiPageID "16638855".
- Unresolved_complex_mixture wikiPageLength "15760".
- Unresolved_complex_mixture wikiPageOutDegree "19".
- Unresolved_complex_mixture wikiPageRevisionID "554170177".
- Unresolved_complex_mixture wikiPageWikiLink Athabasca_oil_sands.
- Unresolved_complex_mixture wikiPageWikiLink Category:Chromatography.
- Unresolved_complex_mixture wikiPageWikiLink Category:Gas_chromatography.
- Unresolved_complex_mixture wikiPageWikiLink Category:Toxicology.
- Unresolved_complex_mixture wikiPageWikiLink Comprehensive_two-dimensional_gas_chromatography.
- Unresolved_complex_mixture wikiPageWikiLink Ecotoxicology.
- Unresolved_complex_mixture wikiPageWikiLink Endocrine_disruptor.
- Unresolved_complex_mixture wikiPageWikiLink Environmental_chemistry.
- Unresolved_complex_mixture wikiPageWikiLink Flame_ionization_detector.
- Unresolved_complex_mixture wikiPageWikiLink GCxGC.
- Unresolved_complex_mixture wikiPageWikiLink Gas-liquid_chromatography.
- Unresolved_complex_mixture wikiPageWikiLink Gas_chromatography.
- Unresolved_complex_mixture wikiPageWikiLink Mass_spectrometry.
- Unresolved_complex_mixture wikiPageWikiLink Naphthenic_acid.
- Unresolved_complex_mixture wikiPageWikiLink Pollution.
- Unresolved_complex_mixture wikiPageWikiLink Polycyclic_aromatic_hydrocarbon.
- Unresolved_complex_mixture wikiPageWikiLink Time-of-flight_mass_spectrometry.
- Unresolved_complex_mixture wikiPageWikiLink Toxicology.
- Unresolved_complex_mixture wikiPageWikiLink United_States_Environmental_Protection_Agency.
- Unresolved_complex_mixture wikiPageWikiLink File:NonBiodegradedAndBiodegraded.png.
- Unresolved_complex_mixture wikiPageWikiLinkText "Unresolved complex mixture".
- Unresolved_complex_mixture wikiPageWikiLinkText "complex mixture".
- Unresolved_complex_mixture wikiPageWikiLinkText "unresolved complex mixture".
- Unresolved_complex_mixture hasPhotoCollection Unresolved_complex_mixture.
- Unresolved_complex_mixture wikiPageUsesTemplate Template:Reflist.
- Unresolved_complex_mixture subject Category:Chromatography.
- Unresolved_complex_mixture subject Category:Gas_chromatography.
- Unresolved_complex_mixture subject Category:Toxicology.
- Unresolved_complex_mixture hypernym Feature.
- Unresolved_complex_mixture type Work.
- Unresolved_complex_mixture type Process.
- Unresolved_complex_mixture type Specialty.
- Unresolved_complex_mixture type Technique.
- Unresolved_complex_mixture type Technology.
- Unresolved_complex_mixture comment "Unresolved complex mixture (also UCM or hump) is a feature frequently observed in gas chromatographic (GC) data of crude oils and extracts from organisms exposed to oil.The reason for the UCM hump appearance is that GC cannot resolve and identify a significant part of the hydrocarbons in crude oils. The resolved components appear as peaks while the UCM appears as a large background/platform.".
- Unresolved_complex_mixture label "Unresolved complex mixture".
- Unresolved_complex_mixture sameAs m.03yj00z.
- Unresolved_complex_mixture sameAs Гасно_хроматографски_стабилне_комплексне_смеше.
- Unresolved_complex_mixture sameAs Q873121.
- Unresolved_complex_mixture sameAs Q873121.
- Unresolved_complex_mixture wasDerivedFrom Unresolved_complex_mixture?oldid=554170177.
- Unresolved_complex_mixture depiction NonBiodegradedAndBiodegraded.png.
- Unresolved_complex_mixture isPrimaryTopicOf Unresolved_complex_mixture.