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Analyzing radiometric dating, heavy metals, and Pb isotopes from a sediment core in Huguangyan Maar Lake was the first atmospheric heavy metal pollution of southern China over the past 200 years. The lake's Zn, Cd, Sb, Tl, and Pb are closely related to anthropogenic activities, while Cr and Ni are mainly derived from basalt weathering. With the rise after 1850, southern China's increase in atmospheric Pb occurred earlier than in other parts of China. Pb is the most common source of recent atmospheric Pb, according to the three-end-member Pb isotopes' three-end-member model. In the 1960s, the proportion of Pb derived from vehicle exhaust emissions hit a peak in the 1960s, before gradually decreasing and finally lowered with the ban on leaded gasoline after 2000. These findings are vital in determining the sources of atmospheric heavy metal pollution and establishing pollution control policies.
Source link: https://europepmc.org/article/MED/35346700
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