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- Q873121 subject Q6511360.
- Q873121 subject Q7308326.
- Q873121 subject Q7308346.
- Q873121 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.".
- Q873121 thumbnail NonBiodegradedAndBiodegraded.png?width=300.
- Q873121 wikiPageExternalLink pegg.
- Q873121 wikiPageWikiLink Q1138899.
- Q873121 wikiPageWikiLink Q1412144.
- Q873121 wikiPageWikiLink Q180809.
- Q873121 wikiPageWikiLink Q1964898.
- Q873121 wikiPageWikiLink Q321355.
- Q873121 wikiPageWikiLink Q407212.
- Q873121 wikiPageWikiLink Q460173.
- Q873121 wikiPageWikiLink Q5513068.
- Q873121 wikiPageWikiLink Q58734.
- Q873121 wikiPageWikiLink Q6511360.
- Q873121 wikiPageWikiLink Q677065.
- Q873121 wikiPageWikiLink Q7218.
- Q873121 wikiPageWikiLink Q7308326.
- Q873121 wikiPageWikiLink Q7308346.
- Q873121 wikiPageWikiLink Q754632.
- Q873121 wikiPageWikiLink Q873305.
- Q873121 wikiPageWikiLink Q874402.
- Q873121 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.".
- Q873121 label "Unresolved complex mixture".
- Q873121 depiction NonBiodegradedAndBiodegraded.png.