High Quality Content by WIKIPEDIA articles! 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. 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. 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....

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