Time Trends of PCDDs/DFs in Lake Biwa and Osaka Bay.

Sakai, Shin’ichi; Deguchi, Shingo; Urano, Shinya; Takatsuki, Hiroshi; Megumi, Kazuko

doi:10.5985/jec.9.379

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…Thus, the increases in levels of TeCDDs and PeCDDs in the sediment core from Lake Suwa were dependent on the use of CNP. Similarly, high concentrations of PCDDs/DFs in sediment, which were dependent on the historic use of PCP and CNP in paddy fields, were observed in other parts of Japan, such as Osaka Bay, Tokyo Bay, Lake Biwa, and Lake Shinji (Hosomi et al, 2003;Masunaga et al, 2001a;Sakai et al, 1999;Sakai et al, 2002;Takeda et al, 2003). These results and those of the present study indicated that the PCDD contamination in the sediment was dependent on the historic use of PCP and CNP.…”

Section: Vertical Changes In Concentrations Of Dioxins and Pahssupporting

confidence: 82%

“…It was reported that the levels of deposition flux of PCDDs/DFs in Osaka Bay and Lake Biwa, located in urban areas in Japan, were 1-3 ng/cm 2 /yr and 1 ng/cm 2 /yr, respectively. In addition, Lake Shiraike and Lake Takanaminoike, located in rural areas in Japan, had fluxes of 0.002-0.02 ng/cm 2 /yr and 0.01 ng/cm 2 /yr, respectively (Sakai et al, 1999;Sakai et al, 2002). Lake Suwa is located in a rural area.…”

Section: Depositions Of Dioxins and Pahsmentioning

confidence: 99%

“…The historical changes in deposition rate of dioxins and PAHs have been determined using sediment cores in USA, Europe, and Japan (Chirenzelli et al, 2001;Hosomi et al, 2003;Macdonald et al, 1998;Masunaga et al, 2001a;Rose and Rippey, 2002;Sakai et al, 1999;Sakai et al, 2002;Takeda et al, 2003). These studies used radioactive isotopes (e. g. 210 Pb, 137 Cs) to determine sedimentation rates in aquatic environment.…”

Section: Introductionmentioning

confidence: 99%

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

Ikenaka

Eun

Watanabe

et al. 2005

Environmental Pollution

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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

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Section: Vertical Changes In Concentrations Of Dioxins and Pahssupporting

confidence: 82%

Section: Depositions Of Dioxins and Pahsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Ikenaka

Eun

Watanabe

et al. 2005

Environmental Pollution

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“…There is a strong positive correlation between the concentration of persistent organic pollutants in the sediments, specifically total PC DDs (Sakai et al 1999) and the (j 15N signature of the Isaza (R 2 =O.88, N=8, P<O.OOI). The organic pollutants PCDDs and PCDFs have been continuously increasing since 1960, despite the cessation of PCP(pentachlorophenol) production in the 1960s and of CNP(chlornitrofen) production in 1970s.…”

Section: Ogawa Et Al (2001) Analyzed Nitrogen Isotope Ratios Of Isazmentioning

confidence: 97%

Lessons from Lake Biwa and Other Asian Lakes: Global and Local Perspectives

Kumagai

Vincent

Ishikawa

et al. 2003

Freshwater Management

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The freshwater resources of Asia are under enormous pressure given the high and increasing population densities of the region, and the serious degradation of many lakes and rivers due to agricultural, industrial and urban development. Global climate change is likely to exacerbate these pressures through changes in the hydrological balance; influences on stratification, algal blooms and deep water re-oxygenation; and for high altitude sites such as lakes on the Mongolian Plateau, accelerated permafrost melting and desertification. Eutrophication and other processes of water quality degradation are especially severe in many parts of China. At Lake Taihu, a drinking water supply for 40 million people in central China, toxic cyanobacterial blooms now occur throughout the year. In the Province of Yunnan, many of the shallow lake waters are highly polluted and are of human health concern. Lake Biwa, Japan's largest freshwater body, has experienced many environmental problems over the last 50 years including loss of species habitat, changes in oxygen content, and blooms of noxious cyanobacteria. Two multi-disciplinary research programs involving specialists in hydrodynamics, bio-optics, biogeochemistry and freshwater ecology have generated new insights into the structure and functioning of the Lake Biwa ecosystem, and have contributed an improved and lakes elsewhere, will especially depend on an improved scientific understanding of the Iimnological controls on water quality. It will also be fostered by cross-disciplinary and international exchanges of information, and a commitment by scientists, residents and others with a vested interest in water quality, including regulatory authorities, to work together towards the common goal of long term, integrated protection of the lake and its surrounding watershed.

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