渤海湾潮滩不同粒径沉积物中多环芳烃的分布

利用湿筛分离的方法,将采自渤海湾潮间带的沉积物分成0.063mm 3个不同的粒径组分,测定其16种EPA规定的多环芳烃(PAHs)含量、总有机碳(TOC)和碳黑(BC)含量.结果表明,不同粒径沉积物中∑PAHs含量范围在714~4870ng/g之间.在岐口(TS3)沉积物中,∑PAHs含量最高值出现在0.063mm粒径组分中.所有站点沉积物的0.031~0.063mm粒径组分中∑PAHs含量均为最低.尽管如此,有机碳标准化∑PAHs含量则随着沉积物粒径的增大呈现增加趋势.不同粒径沉积物中∑PAHs含量与BC含量之间呈现显著正相关关系,而与有机碳(OC=TOC-BC)含量之间的相关性较差.因此,不同粒径沉积物中BC的分布很可能在其中扮演着更重要的作用.

Distribution of polycyclic aromatic hydrocarbons (PAHs) in different size fractions of sediments from intertidal zone of Bohai Bay, China

Concentrations of 16EPA polycyclic aromatic hydrocarbons (PAHs), total organic carbon (TOC) and black carbon (BC) contents were investigated in different size fractions (0.063mm) of sediments from intertidal zone of Bohai Bay. The total PAHs (16-EPA) concentration in different size fractions of all sediments ranged from 714.28to 4869.71ng/g dry weight. The highest total PAHs concentration of Qikou estuary (TS3) sediment was measured in the 0.063mm size fractions. The lowest total PAHs concentrations were measured in the 0.031-0.063mm size fraction for all site sediments. However, TOC-normalized total PAHs concentrations trended to increase with increasing size of sediments. Furthermore, stronger correlations between total PAHs versus BC rather than versus OC (OC=TOC-BC) were found. Therefore, distribution of BC in different size fractions of sediments possibly played a more important role.