Sakai Mizuki, Seike Nobuyasu, Kobayashi Jun, Kajihara Hideo, Takahashi Yukio
National Institute for Agro-Environmental Science, 3-1-3 Kannondai, Tsukuba, Ibaraki 305-8604, Japan.
Environ Pollut. 2008 Dec;156(3):760-8. doi: 10.1016/j.envpol.2008.06.004. Epub 2008 Jul 16.
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.
对从日本新潟富野泻湖和加目田盆地采集的沉积物岩芯、表层沉积物样本及稻田土壤样本中的多氯代二苯并 - 对 - 二噁英（PCDDs）和多氯代二苯并呋喃（PCDFs）进行了分析，以阐明其在泻湖沉积物中的浓度随时间的变化趋势以及沉积物与稻田土壤之间的关系。还估算了这些污染物的质量平衡，以确定它们在地表水中的长期归宿。通过化学质量平衡分析确定，农用化学品五氯苯酚和2,4,6 - 三氯苯基4 - 硝基苯基醚是PCDD/Fs的主要来源。根据过去40年加目田盆地质量平衡的研究结果，我们估计流入加目田盆地的PCDD/Fs中超过一半已经消失。我们认为从稻田流出的PCDD/Fs已转移到下游盆地。
