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首页> 外文期刊>Limnology >Long-range transport of heavy metals from the Asian continent contributes to surface sediments in Lakes Shinji and Nakaumi in western Japan
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Long-range transport of heavy metals from the Asian continent contributes to surface sediments in Lakes Shinji and Nakaumi in western Japan

机译：来自亚洲大陆的重金属的远程运输有助于在日本西部的湖岸和纳库姆的地表沉积物

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摘要

To evaluate the contribution of the long-range transport of heavy metals from the Asian continent to the enrichment of surface sediments in western Japan, heavy-metal (Cd, Cu, Pb, Sb, and Zn) concentrations were measured in sediment cores collected at three sites each in Lakes Shinji and Nakaumi. Sedimentation fluxes of these metals were calculated on the basis of their concentrations in excess of their background concentrations. Pb showed similar sedimentation fluxes in the sites, suggesting a predominant contribution of atmospheric deposition of Pb transported from the Asian continent to the input to the lakes. In contrast, the sedimentation fluxes of heavy metals other than Pb in the surface sediments were markedly high near the estuary of a principal river flowing into Lake Nakaumi. A highly positive correlation was observed between the Cd and Zn concentrations in the cores at each site (r (2) = 0.84-0.97). The Cd/Zn ratios in the surface sediments (1990-2007) indicated that Lake Shinji sediments have ratios of 0.0067-0.0074, higher than those of Tokyo Bay sediments (0.0054 on average in 1990-2003), which have been polluted primarily by effluent discharges. In contrast, the ratios in Lake Nakaumi sediments (0.0053-0.0060) were close to those in Tokyo Bay sediments. Rainwater and aerosols, which were strongly affected by air pollutants from the Asian continent, have much higher Cd/Zn ratios of 0.014-0.016. This suggests that the Lake Shinji sediments with higher Cd/Zn ratios are less affected by effluent discharges. Hence, Lake Shinji sediments may be suitable for assessing the environmental impact of the long-range transport of heavy metals from the Asian continent.
机译：为了评估亚洲大陆的重金属远程金属的远程金属的贡献，在日本西部地表沉积物中，在收集的沉积物核心中测量重金属（CD，Cu，Pb，Sb和Zn）浓度三个地点每个湖中津和纳库姆。这些金属的沉降助熔剂是根据其浓度计算的，这些金属的浓度超过其背景浓度。 PB在位点上显示出类似的沉降助熔剂，表明Pb的大气沉积从亚洲大陆运输到湖泊的投入的主要贡献。相反，除了流入Nakaumi湖的主要河流中，表面沉积物中的重金属的重金属的沉降助熔剂显着高。在每个部位的CD和Zn浓度之间观察到高度阳性相关（R（2）= 0.84-0.97）。表面沉积物（1990-2007）中的CD / Zn比表明，南施济湖沉积物的比例为0.0067-0.0074，高于东京湾沉积物（1990-2003平均平均0.0054），这主要受排出物污染放电。相比之下，Nakaumi沉积物山脉（0.0053-0.0060）的比率接近东京湾沉积物。雨水和气溶胶受到亚洲大陆空气污染物的强烈影响，具有更高的CD / Zn比率为0.014-0.016。这表明含有较高CD / Zn比率的Shinji沉积物的沉积物受流出物放电的影响较小。因此，石吉湖沉积物可能适用于评估远程金属远程金属的环境影响来自亚洲大陆。

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