Aliphatic and Polycyclic Aromatic Hydrocarbons and Sulfur/Oxygen Derivatives in Northwestern Mediterranean Sediments: Spatial and Temporal Variability, Fluxes, and Budgets
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- 作者：Immaculada Tolosa ; Josep M. Bayona ; and Joan Albaigé ; s
- 刊名：Environmental Science & Technology
- 出版年：1996
- 出版时间：August 1996
- 年：1996
- 卷：30
- 期：8
- 页码：2495 - 2503
- 全文大小：785K
- 年卷期：v.30,no.8(August 1996)
- ISSN：1520-5851
文摘
The spatial and temporal distribution of aliphatic andpolycyclic aromatic hydrocarbons (PAHs) andsulfur/oxygen derivatives in sediments from the NWMediterranean basin were investigated. Along theContinental Shelf and slope, an unresolved complexmixture (UCM) of aliphatic hydrocarbons and alkylated PAHs, indicative of petrogenic inputs, werepredominant. Long-chain n-alkanes derivedfromterrestrial plant waxes (n-C27,n-C29, and n-C31)andparent PAHs, which are typical of high-temperaturecombustion processes, were evenly distributed inthe whole basin and largely prevailing in the deepestareas. Perylene, a geochemically derived PAH, wasfound highly abundant in the areas influenced byriver discharges. The highest anthropogenic hydrocarbon inputs were found near the cities of Marseilleand Barcelona, being the contribution of the RhoneRiver ca. 25 times higher than that of the Ebro.Fluxes of PAHs in the deep basin were consistent witha predominant atmospheric input. These resultsaccount for an accumulation rate in the NW Mediterranean sediments of 2700 t/year of petrogenicunresolved hydrocarbons (UCM) and 60 t/year of pyrolyticPAHs. Analyses of dated sediment cores from theRhone and Ebro prodeltas exhibited maximum accumulation rates of PAHs in the 1920-1940 and the1975-1990 periods, although with a steep decrease since1985 in the Rhone area.