Abstract:Concentrations and the isotopic compositions of Pb (208Pb/206Pb and 207Pb/206Pb) in the Usnea longissima from 13regions in the alpine area of southwest China were analyzed. Atmospheric Pb pollution and the potential sources were discussed based on the chemical data as well as the Pb concentrations in the soils. Mean Pb concentrations varied between 1.5 and 64.5mg/kg in the Usnea longissima samples, which all showed high values in the regions near the city and non-ferrous metal production area, similar to the spatial variations of Pb concentrations in the soils. Concentrations of Pb in the Usnea longissima and soil showed positive correlation (r=0.919, P<0.01), implying the Pb concentrations in the Usnea longissima indicate the atmospheric Pb pollution levels. The 208Pb/206Pb and 207Pb/206Pb ratios were 2.099~2.123 and 0.852~0.874 in the Usnea longissima, respectively. Combining the results of Pb isotopic compositions in the Usnea longissima and in potential sources, we deduced that atmospheric Pb pollution in the alpine area of southwest China should primarily be attributed to regional emissions from non-ferrous metal production industries and may also influenced by the emission from leaded gasoline used in Myanmar.
燕婷, 刘恩峰, 张恩楼, 朱育新. 基于地衣植物监测法的我国西南高山地区大气铅污染研究[J]. 中国环境科学, 2015, 35(9): 2772-2777.
YAN Ting, LIU 恩Feng, ZHANG 恩Lou, ZHU Yu-Xin. Atmospheric Pb pollution in the alpine area of southwest China based on the lichens (Usnea longissima) analysis. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(9): 2772-2777.