胶州湾内外沉积物岩芯中多氯萘的分布特征研究

利用13 C同位素稀释-高分辨率气相色谱-高分辨率质谱法测定了胶州湾内、外沉积物岩芯中多氯萘(PCNs)异构体的含量,对其同系物分布、可能来源、沉积通量及毒性当量进行了初步探讨,并研究了由各类来源PCNs进入到胶州湾的历史沉积趋势.结果表明,胶州湾内、外沉积物岩芯中∑PCNs含量范围分别为3.9～56.4 Pg·g-1...

Distribution characteristics of polychlorinated naphthalenes in sediment cores inside and outside of Jiaozhou Bay

Concentrations of 36 congeners of polychlorinated naphthalenes (PCNs) in the sediment core collected from Qingdao coastal sea were measured using 13C isotope dilution-HRGC-HRMS method. The vertical distributions, sedimentation fluxes, homologue profiles, toxic equivalents and sources of PCNs were discussed. The historical trends of contributions from different sources of PCNs in the sediments were studied. The total PCN concentrations in the cores inside and outside Jiaozhou Bay were in the range of 3.86~56.4 pg•g-1 dw and 9.9~29.5 pg•g-1 dw, respectively. The PCNs in both the cores were dominated by tri-CNs and tetra-CNs, accounting for over 80% of the total PCNs, similar to the composition of technical products Halowax. The maximum PCN sedimentation fluxes occurred at mid-1970s and late-1990s inside and outside Jiaozhou Bay, respectively. The PCNs in the early years (1950s) were mainly from wood and coal burning, whereas input of Hallowax pollution to the bay during the period from 1970s to 1990s was suggested. The increase of the indicator isomers of PCNs for fly-ash in the top layers of the sediment core J37 indicates that the contribution from municipal solid waste combustions has been more important in recent years. PCN-TEQ in all of the sediments were lower than 0.1 pg•g-1, with relatively minor contribution to the total TEQs.