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首页> 外文期刊>Journal of environmental monitoring: JEM >Chronological trends in trace metals recorded by a tree bark pocket in Yakushima Island, Japan
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Chronological trends in trace metals recorded by a tree bark pocket in Yakushima Island, Japan

机译：日本屋久岛树皮口袋记录的痕量金属的时序趋势

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摘要

Bark included within the trunk of a 200-year-old Japanese cedar tree harvested in Yakushima Island, Japan, a World Natural Heritage Site located 150 km south of mainland Japan and 800 km east of Shanghai, China, was analysed for trace metals by ICP-MS providing a chronology of atmospheric pollution. The concentration of V, As and Pb in decadal sections of the bark pocket increased 30 to 50 fold from 1900-09 to 1960-69, indicating increased atmospheric deposition of these metals. The trend coincided with the establishment and expansion of heavy industries in Kyushu, Japan, resulting in locally high levels of air pollution. V, As and Pb subsequently declined, reflecting lower industrial emissions following air pollution control legislation from the late 1960's and decline in heavy industries. Ni, Cu and Zn showed a relatively small, 7 to 10 fold increase over time. Lead isotope ratios in the bark pockets shifted from about 0.84 to 0.86 for Pb-207/Pb-206 and from 2.04 to 2.10 for Pb-208/Pb-206, showing that the origin of atmospheric lead changed over time from coal to more diverse sources.
机译：ICP分析了在日本屋久岛（Yakushima Island）上收获的一棵具有200年历史的日本杉树的树干中的树皮，该世界杉树位于日本大陆以南150公里，中国上海以东800公里处，是世界自然遗产-MS提供了大气污染的年表。从1900-09年到1960-69年，树皮袋十个部分中的V，As和Pb的浓度增加了30到50倍，表明这些金属在大气中的沉积增加。这种趋势与日本九州重工业的建立和扩张相吻合，导致当地空气污染水平很高。 V，As和Pb随后下降，反映出自1960年代后期开始实施空气污染控制法规以来，工业排放降低以及重工业下降。 Ni，Cu和Zn相对较小，随时间增加7至10倍。树皮袋中铅的同位素比率从Pb-207 / Pb-206的约0.84变为0.86，而Pb-208 / Pb-206的从2.04变为2.10，这表明大气铅的来源随时间从煤炭变为更多样化资料来源。

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