Chemical and sulfur isotopic characteristics of precipitation in a representative urban site, South China: implication for anthropogenic influences,Air Quality, Atmosphere & Health

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Chemical and sulfur isotopic characteristics of precipitation in a representative urban site, South China: implication for anthropogenic influences
Air Quality, Atmosphere & Health ( IF 5.1 ) Pub Date : 2020-01-21 , DOI: 10.1007/s11869-020-00798-7
Fangwen Zheng , Wenbo Rao , Xiaodong Chu , Hua Bai , Sanyuan Jiang

Nanchang, the capital of Jiangxi Province, is a major constituent of the South China Acid Rain Zone. In this study, the chemical and sulfur isotopic compositions of precipitation in this region were investigated during 2015–2016 to clarify the origin of major chemicals. The pH was < 5.6 for 72.6% of precipitation events, reflecting the predominance of acid rain. SO 4 2− , Ca 2+ , NH 4 + , and NO 3 − were the four main ions, occupying 77% of the total ions in precipitation. SO 4 2− and NO 3 − were the dominant acidifying species while Ca 2+ and NH 4 + were the dominant neutralizing species. Overall, the concentrations of ions in precipitation were lower in the rainy months than in other months. Compared with foreign cities, the concentrations of ions in precipitation, particularly SO 4 2− and NO 3 − , were significantly higher in Nanchang, indicating the effect of anthropogenic pollution. Factor analyses showed that in precipitation, anthropogenic pollutants controlled SO 4 2− , NO 3 − , and NH 4 + whereas K + , Mg 2+ , and Ca 2+ originated from rock weathering, and Cl − was dominantly of marine origin. Based on the sulfur isotope data, it was further found that precipitation SO 4 2− was associated with the use of northern Chinese coal in Nanchang and homogeneous oxidation was a major mechanism affecting δ 34 S fluctuations in precipitation SO 4 2− with time. This work provides deep insights into the formation of acid rain and is helpful for guiding air quality protection in South China.

更新日期：2020-01-21

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