Regional Characteristics of Sulfur and Lead Isotope Ratios in the Atmosphere at Several Chinese Urban Sites

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• 作者：Hitoshi Mukai ; Atsushi Tanaka ; Toshihiro Fujii ; Yiqiang Zeng ; Yetang Hong ; Jie Tang ; Song Guo ; Husheng Xue ; Zhuolian Sun ; Jiti Zhou ; Daming Xue ; Jing Zhao ; Guihua Zhai ; Jingliang Gu ; and Pingyang Zhai
• 刊名：Environmental Science & Technology
• 出版年：2001
• 出版时间：March 15, 2001
• 年：2001
• 卷：35
• 期：6
• 页码：1064 - 1071
• 全文大小：139K
• 年卷期：v.35,no.6(March 15, 2001)
• ISSN：1520-5851

文摘

Sulfur and lead isotope ratios in the atmosphere weremeasured at several selected sites (Harbin, Changchun,Dalian, Waliguan, Shanghai, Nanjing, Guiyang) in China andTsukuba (Japan), to reveal regional sources characteristicsover Eastern Asia. Average S isotope ratios for SO₂and sulfate in the atmosphere in China were close tothose of the coals used in each region, indicating aconsiderable contribution of coal combustion to the sulfurcompounds in the atmosphere. Most northern cities hadaround 5” sulfur isotope ratio, while Guiyang, a southwesterncity in China, showed a considerably lower sulfur isotoperatio (about -3”) because of the unusually light sulfurisotope ratio of coals in this region. These were considerablydifferent from the value (-1.4”) for Tsukuba (Japan).Lead isotope ratios also suggested that coal combustionconsiderably contributed to atmospheric lead in some casesin China. At the same time, influences by the emissionof Chinese lead ores were also observed in northern cities.Seasonal variations of both sulfur and lead isotoperatios indicated the existence of a certain amount ofindustrial sources other than coal combustion. In addition,fractionation effect between SO₂ and sulfate showed aseasonal tendency (high in winter (0-6”) and low in summer(-1-3”)), suggesting the oxidation pathway of SO₂changed seasonally.