Estimation of sources and inflow of dioxins and polycyclic aromatic hydrocarbons from the sediment core of Lake Suwa, Japan

Abstract

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. CapsuleLarge amounts of dioxins and PAHs flowed into a lake in flood events

Seasonal Deposition Fluxes of Polycyclic Aromatic Hydrocarbons (PAHs) in Lake Biwa, Japan

“…The PAHs contents are generally comparable to those in remote/rural or midsize city area. The average deposition flux of total PAHs (ng cm -2 year -1 ) in this study was higher than that in remote lakes (Gschwend and Hites, 1981), comparable to that in rural area (Ikenaka et al, 2005), and lower than that near urban area (Bixian et al, 2001;Latimer and Quinn, 1996) (Table 3).…”

Heavy Metal Accumulation in Lake Sediments, Fish (Oreochromis niloticus and Serranochromis thumbergi), and Crayfish (Cherax quadricarinatus) in Lake Itezhi-tezhi and Lake Kariba, Zambia

“…We used this data to evaluate spatial and species differences in heavy metal accumulation in the aquatic systems of Zambia. Lake sediments are often sampled to assess the level of environmental pollution (Ikenaka et al 2005a). In polluted aquatic systems sediments are increasingly recognized as the most important sink for contaminants and a future source of pollutants (Ikenaka et al 2005b).…”

Depositional History of Polycyclic Aromatic Hydrocarbons: Reconstruction of Petroleum Pollution Record in Peninsular Malaysia

“…Flood as a natural disaster contributes in PAHs irregular concentrations where it washes out city surface to water bodies such as rivers and streams. Ikenaka et al, (2005) reported the highest PAHs of core layers with multiple pyrogenic sources from Lake Suwa, Japan when the heavy rain and consequently flood had been historically consistent. Discharges from natural disasters and local input are characterized by irregular distributions of PAHs.…”