Unresolved complex mixture
- Unresolved complex mixture
Unresolved Complex Mixture (also "UCM" or "hump") is a feature frequently observed in gas chromatographic (GC) data of crude oils and other substances. The reason for its 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 then 50 % of the total area of the chromatogram, while in biodegraded oils this figure can rise to around 90 %. UCM is also observed in certain refined fractions such as lubricating oils ( [Gough, M. A. & Rowland, S. J. (1990) Characterization of unresolved complex mixtures of hydrocarbons in petroleum. "Nature" 344, pp. 648-650] and references therein).
ee also
* Gas-liquid chromatography
References
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