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Showing 1 to 7 of 7 for “"Unresolved complex mixture."”.
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Qualitative and quantitative assessment of UCM in PM2.5 of Bakersfield, CA.
… spectrometer (GC-MS). Substantial presence of unresolved complex mixture (UCM) was observed in the collected PM ₂.₅ . To quantify the overlapping UCM peaks, a method was developed for the deconvolution (peak separation) of the UCM. This enabled unique quantification of each UCM peak. The …
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Environmental organic geochemistry of sediments from Wadi Gaza and investigation of bioremediation of petroleum derivatives and herbicides by cyanobacterial mats under different experimental conditions
… the presence of pristane and phytane, an unresolved complex mixture (UCM), the UCM/n-alcane ratio, the low carbon preference index (CPI ca. 1), steranes and hopanes and the presence of the phenanthrene, dibenzothiophene and their alkylated homologues confirms the input of crude oil and …
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The Temporal and Spatial Distribution of Hydrocarbons in Atmospheric Deposition From Stations Surrounding Lower Chesapeake Bay
… polycyclic aromatic hydrocarbons (PAH), and the unresolved complex mixture (UCM). The PAH and the UCM were an indication of significant anthropogenic inputs while the odd/even distribution of the n-alkanes was an indication of biogenic sources. These findings indicated seasonal trends of highest …
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Biodegradation, water solubility and characterisation studies of unresolved complex mixtures (UCMs) of aromatic hydrocarbons
… the simple, volatile hydrocarbons leaving an unresolved complex mixture (UCM) comprising the more environmentally persistent components. Aromatic UCMs have been reported in a wide variety of environmental matrices. Recent studies indicate such material, particularly monoaromatic hydrocarbons, …
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Molecular Characterisation of Fluidised Catalytic Cracker Feedstocks using Ruthenium Tetroxide Oxidation: a Study of Model Hydrocarbons
… fractions, and as such constitute highly complex mixtures of aromatic and aliphatic hydrocarbons. Gas chromatography (GC) analysis of heavy petroleum fractions reveals a broad 'hump' of unresolved compounds termed an Unresolved Complex Mixture (UCM) of hydrocarbons. Conventional …
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Characterisation and environmental effects of unresolved complex mixtures of hydrocarbons
… crude oil hydrocarbons reveal both resolved and unresolved components. The unresolved feature is commonly referred to as the unresolved complex mixture (UCM). UCMs are thought to result from the co-elution of complex mixtures of hydrocarbons with similar chemical properties and become more …
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Characterisation of waxy gas-condensates by high temperature capillary gas chromatography and oxidative degradation
… In addition those hydrocarbons which remain unresolved when analysed by gas chromatography (so called unresolved complex mixtures UCMs) are also studied. UCMs may account for a large portion of the hydrocarbons in many fossil fuels yet very little is known about their composition. Knowledge …