Combined with quantitative determination of concentration and isotopic composition of petroleum
hydrocarbons, weathering simulation experiments on artificially mixed oils and their two end-member
oils are performed for identification and quantification of mixed sources. The >C18 n-alkanes show no
appreciable losses during a short-term weathering process. An approach based on distribution of longchain
n-alkanes (>C18) is suggested for estimating the contribution proportion of each source in mixed
oils. Stable carbon isotope profile of individual n-alkanes is a powerful tool to differentiate sources of
oil spills, but unavailable to accurately allocate each contribution due to a relatively large analytical error. IsoPrime 稳定同位素质谱仪
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