Ikenaka Yoshinori, Eun Heesoo, Watanabe Eiki, Kumon Fujio, Miyabara Yuichi
Research and Education Center for Inlandwater Environment, Shinshu University, 5-2-4 Kogandori, Suwa, Nagano 392-0027, Japan.
Environ Pollut. 2005 Dec;138(3):529-37. doi: 10.1016/j.envpol.2005.04.014.
To elucidate the historical changes in polychlorinated dibenzo-p-dioxin (PCDD), polychlorinated dibenzofuran (PCDF), coplanar polychlorinated biphenyl (co-PCB), and polycyclic aromatic hydrocarbon (PAH) inflows in Lake Suwa, their concentrations in the sediment core were analyzed in 5 cm interval. The maximum concentrations (depth cm) of PCDDs/DFs, co-PCBs, and PAHs were 25.2 ng/g dry (30-35 cm), 19.0 ng/g dry (30-35 cm), and 738, 795 ng/g dry (50-55 cm, 30-35 cm), respectively. Age and sedimentation rate of the sediment were estimated from the vertical changes in apparent density. Deposition rate of dioxins and PAHs were calculated from the concentration and sedimentation rate of the sediment. The results indicate that large amounts of dioxins and PAHs flowed into the lake in flood stage compared to normal stage.
为阐明日本诹访湖多氯二苯并对二噁英（PCDD）、多氯二苯并呋喃（PCDF）、共平面多氯联苯（co-PCB）和多环芳烃（PAH）流入量的历史变化，对沉积物岩芯中这些物质的浓度按5厘米间隔进行了分析。PCDDs/DFs、co-PCBs和PAHs的最大浓度（深度厘米）分别为25.2纳克/克干重（30 - 35厘米）、19.0纳克/克干重（30 - 35厘米）以及738、795纳克/克干重（50 - 55厘米、30 - 35厘米）。根据视密度的垂直变化估算了沉积物的年龄和沉积速率。根据沉积物的浓度和沉积速率计算了二噁英和PAHs的沉积速率。结果表明，与正常阶段相比，洪水期有大量二噁英和PAHs流入该湖。
