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Mass balance and long-term fate of PCDD/Fs in a lagoon sediment and paddy soil, Niigata, Japan |
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| Authors: | Sakai Mizuki Seike Nobuyasu Kobayashi Jun Kajihara Hideo Takahashi Yukio |
| Institution: | a National Institute for Agro-Environmental Science, 3-1-3 Kannondai, Tsukuba, Ibaraki 305-8604, Japan b National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan c National Institute of Advanced Industrial Science and Technology, 16-1 Tsukuba, Ibaraki 305-8569, Japan d Academic Assembly Institute of Science and Technology, Niigata University, 2-8050 Ikarashi, Niigata City 950-2181, Japan |
| Abstract: | Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in a sediment core and in samples of surface sediment and paddy soil collected from the Toyano lagoon and Kameda basin in Niigata, Japan, were analyzed to elucidate the temporal trends of their concentrations in the lagoon sediment and the relationship between the sediment and the paddy soil. The mass balance of these pollutants was also estimated to determine their long-term fate in surface waters. An analysis by chemical mass balance identified the agrochemicals pentachlorophenol and 2,4,6-trichlorophenyl 4-nitrophenyl ether as the major sources of PCDD/Fs. On the basis of the findings regarding the mass balance in the Kameda basin over the last 40 years, we estimate that more than half the input of PCDD/Fs to the Kameda basin has disappeared. We suggest that the PCDD/Fs that flowed out from the paddy fields have been transferred to the lower basin. |
| Keywords: | PCDD/Fs Sediment core Paddy soil CMB Mass balance |
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