渤海及邻近海域表层沉积物中多环芳烃的来源解析

利用GC/MS测定了渤海及其邻近海域表层沉积物中的16种优控多环芳烃(PAHs),采用多种数据分析技术解析了PAHs的来源。结果显示:除了萘、苊烯、苊在部分样品中未检出之外,其他13种PAHs在所有样品中均有检出。总PAHs的含量范围为:(148.27~1211.81)10-9,平均值为507.1310-9。TOC(总有机碳)与总PAHs显著相关(R=0.66,P= 0.0002),表明TOC对研究区域PAHs的分布有重要作用。该海域PAHs以高环(4~6环)为主,轻重比值(LMW/HMW)表明该区域的PAHs主要来自高温燃烧源。分子诊断比值分析也表明,PAHs主要来自生物质、煤炭和石油燃烧。主成分分析-多重线性回归分析(PCA-MLR)表明,沉积物中PAHs主要来自煤炭燃烧源、交通源(石油燃烧)、焦化源和石油源,其贡献分别为54.3%,28.6%,13.4%和3.7%。

Source apportionment of PAHs in surface sediments from Bohai Sea and adjacent area

Sixteen priority polycyclic aromatic hydrocarbons (PAHs) in surface sediments from Bohai Sea and adjacent area were quantified by GC-MS, and sources of PAHs were apportioned based on a variety of data analysis methods. Thirteen PAHs were detected in all samples, excluding naphthalene (NAP), acenaphthylene (ACPY) and acenaphthene (ACP), which were not detected in some samples. The total concentrations of PAHs varied from 148.2710-9 to 1211.8110-9, with a mean value of 507.1310-9. A positive correlation exists between TOC and the total PAH concentrations (R=0.66, P=0.0002), suggesting that TOC content is an important controlling factor for distribution of PAHs in sediment. The proportion of 4~6 ring-PAHs was quite high, with a LMW/HMW value of 0.76, indicating that PAHs were mainly from pyrogenic sources. Molecular diagnostic indices showed that the PAHs were mainly from biomass, coal and petroleum combustion. Principal component analysis-multiple linear regression (PCA-MLR) suggested that coal combustion, traffic (petroleum combustion), coke production and petroleum sources could be the primary PAH contributors, accounting for 54.3%, 28.6%, 13.4% and 3.7% of the total concentrations, respectively.