State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
Sci Total Environ. 2022 Jul 20;831:154829. doi: 10.1016/j.scitotenv.2022.154829. Epub 2022 Mar 26.
The historical atmospheric heavy metal pollution of southern China over the past 200 years was explored by analyzing radiometric dating, heavy metals, and Pb isotopes from a sediment core in Huguangyan Maar Lake. Zn, Cd, Sb, Tl, and Pb in the lake are closely related to anthropogenic activities, while Cr and Ni are mainly derived from the weathering of basalt surrounding the lake. Atmospheric Zn, Cd, Sb, and Tl increased rapidly after 1980, consistent with the local industrial development. The increase of atmospheric Pb in southern China occurred earlier than in other regions of China, with the increase after 1850. War and the use of leaded gasoline were the main causes for the rapid increase in atmospheric Pb during 1910-1950. From 1950 to 2000, the input of Pb from anthropogenic activities decreased gradually due to the stable social environment. After 2000, atmospheric Pb continued to rise due to continued industrial development. The three-end-member model of Pb isotopes indicates that coal combustion is the main source of current atmospheric Pb. The proportion of Pb derived from vehicle exhaust emissions reached a peak in the 1960s, then gradually decreased and further reduced with the ban on leaded gasoline after 2000. These results are important in identifying the sources of atmospheric heavy metal pollution and in formulating pollution control strategies.
通过分析湖广岩玛尔湖沉积物芯的放射性测年、重金属和 Pb 同位素，研究了过去 200 年来中国南方的历史大气重金属污染。湖中 Zn、Cd、Sb、Tl 和 Pb 与人为活动密切相关，而 Cr 和 Ni 主要来自湖周围玄武岩的风化。自 1980 年以来，大气 Zn、Cd、Sb 和 Tl 迅速增加，与当地工业发展相一致。中国南方大气 Pb 的增加早于中国其他地区，1850 年后增加。战争和使用含铅汽油是 1910-1950 年大气 Pb 迅速增加的主要原因。1950 年至 2000 年，由于社会环境稳定，人为活动带来的 Pb 输入逐渐减少。2000 年后，由于工业持续发展，大气 Pb 持续上升。Pb 同位素的三端元模型表明，煤炭燃烧是当前大气 Pb 的主要来源。20 世纪 60 年代，机动车尾气排放导致的 Pb 比例达到峰值，随后逐渐减少，并随着 2000 年后含铅汽油的禁用而进一步降低。这些结果对于识别大气重金属污染的来源和制定污染控制策略非常重要。
