南黄海中部表层沉积物中多环芳烃分布特征及来源分析

Distribution and source identification of polycyclic aromatic hydrocarbon of surface sediments from the center part of South Yellow Sea,China

通过对南黄海中部49个表层沉积物样品进行总有机碳,粒度,多环芳烃和甲基菲等GS-MS定量分析,探讨了研究区沉积物中多环芳烃分布特征,分子组成,评估南黄海中部多环芳烃污染水平并识别其来源.研究表明,南黄海中部14种多环芳烃总量（ΣPAHs）在81.63~6567.31ng/g之间,其中优控多环芳烃（ΣEPAPAHs）11种,含量为29.2~1029.1 ng/g,平均含量255.1 ng/g,与国内外其他地区相比有机污染水平为中-低;苝为研究区内主要多环芳烃,分布较为广泛,其含量占所有PAHs的6.40%~88.85%,低含量苝与人为活动有关,而高含量苝代表了陆源有机质输入;多环芳烃组成,异构体分析和甲基菲特征表明,研究区优控多环芳烃主要为煤和高等植物燃烧或不完全燃烧产物以气溶胶形式输入,但部分样品表现出明显的石油源特性也证实了石油燃料,原油泄露产生的多环芳烃客观存在.

The 49 surface samples collected from the center part of South Yellow Sea were analyzed for total organic carbon（TOC）,particle size,polycyclic aromatic hydrocarbons（PAHs） and methyl phenanthrene.The concentrations of all of 14 PAHs（ΣPAHs） were 81.63 to 6567.31 ng/g dry weight,and the concentrations of anthropogenic PAHs（ΣEPAPAHs） were 29.2 to 1029.1 ng/g,with an average of 255.1 ng/g,suggesting medium-low level pollution in studying area.The less correlations among ΣEPAPAHs,TOC and medium diameter（MD） indicates that atmospheric deposition or leakage of ship-borne petroleum may be main enrichment methods of pollution,comparing with fluvial transport.The concentrations of perylene relative to the penta-aromatic isomers are dominant,with 6.40%~88.85% of ΣPAHs,and the low concentrations of perylene were related by anthropogenic activity,while the high concentrations indicating diagenetic terrestrial origin.The characteristics of high weight compounds,isomers analysis and methyl phenanthrene revealed that the anthropogenic PAHs were mainly derived from combustion or incomplete combustion of coal and higher plants,however,some samples showed obvious petroleum features also confirm the existence of PAHs derived from leakage of petroleum fuel and crude oil.