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Tracing sources of coal combustion using stable sulfur isotope ratios in epilithic mosses and coals from China 总被引:1,自引:0,他引:1
Xiao HY Tang CG Zhu RG Wang YL Xiao HW Liu CQ 《Journal of environmental monitoring : JEM》2011,13(8):2243-2249
In China, coal combustion is the most important source of atmospheric sulfur pollution. Moss sulfur isotopic signatures have been believed to hold source-specific information that can serve as a fingerprint to identify atmospheric sulfur sources. In cities where only local coals were combusted, we observed a good correspondence of average sulfur isotope ratios in urban mosses (Haplocladium microphyllum) to the values of local coals (δ(coals) = 1.455δ(mosses)- 3.945, R(2) = 0.975, p = 0.01). But if different types of coals were combusted, we did not know whether moss sulfur isotope ratios can indicate mixed coals. To confirm this, using a mixing model we estimated the ratios of imported coal to local coals at cities where both coals were used. We found that the estimated ratios at large cities (>1 million people) where both coals were used were similar to the reported ratios in their respective provinces. For small cities (<0.5 million people) in Jiangxi Province and other provinces, the estimated ratios were higher than the reported ratios because the relatively cheaper local coals were less used in all the small cities except in cities where local coal deposits were found nearby. The comparison results showed that moss sulfur isotope is a useful tool for indicating coal-derived sulfur even in cities where mixed coals were combusted. 相似文献
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Wang Ling-Yu Li Xue Luo Kun Song Yu-Hao Liu Ren-Guo 《Environmental science and pollution research international》2022,29(48):72159-72168
Environmental Science and Pollution Research - In this study, cationic polyacrylamide (CPAM)-modified diatomite and cetyl trimethyl ammonium bromide (CTAB)-modified... 相似文献
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Xiao HY Wu LH Zhu RG Wang YL Liu CQ 《Environmental pollution (Barking, Essex : 1987)》2011,159(2):363-367
Nitrogen isotopic composition of new, middle-aged and old camphor leaves in upper and lower canopies has been determined in a living area, near a motorway and near an industrial area (Jiangan Chemical Fertilizer Plant). We found that at sites near roads, more positive δ15N values were observed in the camphor leaves, especially in old leaves of upper canopies, and ?δ15N = δ15Nupper − δ15Nlower > 0, while those near the industrial area had more negative δ15N values and ?δ15N < 0. These could be explained by two isotopically different atmospheric N sources: greater uptake from isotopically heavy pools of atmospheric NOx by old leaves in upper canopies at sites adjacent to roads, and greater uptake of 15N-depleted NHy in atmospheric deposition by leaves at sites near the industrial area. This study presents novel evidence that 15N natural abundance of camphor leaves can be used as a robust indicator of atmospheric N sources. 相似文献
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