Sedimentary records of metal deposition in Japanese alpine lakes for the last 250 years: Recent enrichment of airborne Sb and In in East Asia
Sedimentary records of metal deposition in Japanese alpine lakes for the last 250 years: Recent enrichment of airborne Sb and In in East Asia
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DOI：
10.1016/j.scitotenv.2012.10.037
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发表时间：
2013-01-01
影响因子：
9.8
通讯作者：
Urabe, Jotaro
中科院分区：
文献类型：
--
作者：
Kuwae, Michinobu;Tsugeki, Narumi K.;Urabe, Jotaro
测量了日本北部哈奇曼台山两个原始高山湖泊沉积岩芯中Sb、In、Sn和Bi等18种元素的浓度，代表了过去250年的时间。与铁、锰氢氧化物和有机质的成岩再分配相比，大气中金属沉积更能解释浓度的垂直变化。从铅-210的累积速率和超过1850年前铝归一化平均本底浓度的金属浓度估计了人为金属通量。两湖中Sb和In的人为通量从1900年左右开始逐渐增加，1980年后显著增加。沉积物中Sb/Pb值和Pb值与中国或日本北部地区气溶胶和日本来源物质(最近的交通和焚烧炉产生的粉尘)中的Sb/Pb值和Pb值的比较表明，1980年后Sb通量的显著增加主要是由于亚洲大陆燃煤产生的含Sb和Pb气溶胶的远距离输送增强所致。在两个研究湖泊中，中国煤中In、Sn和Bi的通量呈现出与Sb相似的增加趋势。这表明，尽管日本的焚烧炉可能不被排除为In的来源，但相同的来源可能是In。近250年来的沉积记录表明，近几十年来，东亚地区大气中Sb和In的污染加剧。(C)2012爱思唯尔B.V.保留所有权利。
Concentrations of 18 elements, including Sb, In, Sn, and Bi, were measured in sediment cores from two pristine alpine lakes on Mount Hachimantai, northern Japan, representing the past 250 years. Vertical variations in concentrations are better explained by atmospheric metal deposition than by diagenetic redistribution of Fe and Mn hydroxide and organic matter. Anthropogenic metal fluxes were estimated from Pb-210-derived accumulation rates and metal concentrations in excess of the Al-normalized mean background concentration before 1850. Anthropogenic fluxes of Sb and In showed gradual increases starting around 1900 in both lakes, and marked increases after 1980. Comparison of Sb/Pb and Pb stable isotope ratios in sediments with those in aerosols of China or northern Japan and Japanese source materials (recent traffic- and incinerator-derived dust) suggest that the markedly elevated Sb flux after 1980 resulted primarily from enhanced long-range transport in aerosols containing Sb and Pb from coal combustion on the Asian continent. The fluxes of In, Sn, and Bi which are present in Chinese coal showed increasing trends similar to Sb for both study lakes. This suggests that the same source although incinerators in Japan may not be ruled out as sources of In. The sedimentary records for the last 250 years indicate that atmospheric pollution of Sb and In in East Asia have intensified during recent decades. (C) 2012 Elsevier B.V. All rights reserved.