Historical distribution of PCDDs, PCDFs, and coplanar PCBs in sediment core of Ariake Bay, Japan
Historical distribution of PCDDs, PCDFs, and coplanar PCBs in sediment core of Ariake Bay, Japan
复制标题
DOI：
10.1007/s00244-007-9036-y
复制
发表时间：
2008-04-01
影响因子：
4
通讯作者：
Katase, Takao
中科院分区：
文献类型：
--
作者：
Kim, Yun-Seok;Eun, Heesoo;Katase, Takao
在日本有明湾采集的沉积物样品中测定了持久性有机污染物，特别是多氯二苯并二恶英 (PCDD)、多氯二苯并呋喃 (PCDF)、共面多氯联苯 (co-PCB) 和毒性当量 (pg TEQ g(-1))。矢部川表层沉积物中PCDDs/DFs的总浓度（17,000 pg g(-1)干重）比筑后川（7,000 pg g(-1)干重）高出约2.5倍，其中流入北部湾的流量最高，约为40%。同类物概况表明二恶英来源可能靠近研究区域。沉积物层中的PCDDs浓度（12,000 pg g(-1)干重）对应于1960年代，反映了当时有明湾发生的五氯苯酚（PCP）污染。层次聚类分析显着考虑了沉积物岩心中五氯苯酚的反映。根据异构体特异性分析，四氯二苯并-对-二恶英成分从1978-1982年向地表逐渐增加，表明该时期的污染源可能更多地受到氯硝基苯的影响，而不是五氯苯酚。这一事实得到了 Sigma PCDD 与 Sigma PCDF 浓度比率的支持。在所有检测到的沉积物层中，PCDDs/DFs 衍生的 TEQ 占 Sigma TEQ（PCDDs/DFs 和共 PCBs）的 90% 以上。 PCBs对总TEQ的贡献较低；然而，可以清楚地观察到集中度不断增加的历史趋势。
Persistent organic pollutants, particularly polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), coplanar polychlorinated biphenyls (co-PCBs) and toxic equivalent quantity (pg TEQ g(-1)) were determined in sediment samples collected from Ariake Bay, Japan. The total concentration of PCDDs/DFs in surface sediment of the Yabe River (17,000 pg g(-1) dry wt) was approximately 2.5-fold higher than that of the Chikugo River (7,000 pg g(-1) dry wt) which has the highest flow amount of about 40% inputting to the northern Bay. The congener profile suggested that dioxin sources could be close to the study area. The PCDDs concentration (12,000 pg g(-1) dry wt) in the sediment layer, which was corresponding to the 1960s, was reflected on the pentachlorophenol (PCP) contamination occurring at that time in Ariake Bay. The reflecting of PCP in the sediment core was significantly considered by hierarchical cluster analysis. Based on isomer-specific analysis, the tetrachlorodibenzo-p-dioxin composition showed a gradual increase from 1978-1982 toward the surface, indicating that the pollution source at that period might be more influenced by chloronitrofen than PCP. This fact was supported, based on the ratio of Sigma PCDD to Sigma PCDF concentration. The PCDDs/DFs-derived TEQ contributed more than 90% of the Sigma TEQ (PCDDs/DFs and co-PCBs) in all the detected sediment layers. The contribution of PCBs to the total TEQ was low; however, an increasing historical trend of concentration was clearly observed.