基于统计方法的辽东湾沉积物中多环芳烃来源特征分析

为研究辽东湾表层沉积物中多环芳烃(PAHs)的来源特征,2014年5月采集了20个辽东湾海域表层沉积物样品,并利用气相色谱质谱联用仪对优先控制的16种PAHs进行测定,采用聚类分析、主成分分析-多元线性回归分析、异构体比值3种统计方法对辽东湾表层沉积物中PAHs来源特征进行了研究。结果表明,辽东湾表层沉积物中PAHs含量范围88.5~199.3 ng·g-1,平均值为(126.3±35.3)ng·g-1,其中,萘、菲和荧蒽是PAHs优势组分。通过统计分析结果表明,辽东湾北部表层沉积物中PAHs含量低于西南部,沉积物中PAHs的来源包括石油燃烧来源、煤炭、木材等生物质燃烧来源和石油来源,其中燃烧来源是主要来源,煤炭、木材等生物质燃烧来源占49.9%,石油燃烧来源和石油来源占50.1%。

Source Identification of Polycyclic Aromatic Hydrocarbon of Surface Sediments from Liaodong Bay Based on Statistical Analysis

The source apportionment of 16 polycyclic aromatic hydrocarbons (PAHs) in surface sediment in Liaodong Bay was investigated in May 2014. Cluster analysis, principal component analysis-multiple linear regression and diagnostic ratios were used to identify the sources of PAHs. The total concentrations of PAHs ranged from 88.5 ng g^-1 to 199.3 ng g^-1, with the mean value of (126.3±35.3) ng g^-1. The individual PAHs with the highest concentrations were naphthalene, phenanthrene and fluoranthene. Statistical analysis results indicated that the concentration of PAHs in surface sediments from northern Liaodong Bay was lower than those in the southwest of the Bay. The combustion sources of petroleum products and coal & wood combustion and petroleum sources were the PAHs sources of surface sediment. The major was combustion source. The coal & wood combustion accounted for 49.9% of the total sources, and a mixture of the petroleum combustion and petroleum sources accounted for 50.1%.