Sulfur isotope and chemical composition of the rainwater at the Three Gorges Reservoir

	Sulfur isotope and chemical composition of the rainwater at the Three Gorges Reservoir
	Qixin Wu; Guilin Han
	2015
发表期刊	Atmospheric Research
卷号	155 期号:1 页码:130-140
摘要	Rainwater samples were collected at the Three Gorges Reservoir (TGR) from June 2009 to July 2010 and the pH, major ion concentrations and delta S-34 values of sulfate were measured. The results indicated that the rain in this region was seriously acidized, 60% of the rain events' pH were lower than 5.0. SO42- and NO3- were the main anions, and their volume weighted mean (VWM) values were 161.9 mu eq/L and 65.2 mu eq/L, respectively, which accounted for 71%-99% of the total measured anions. Ca2+ and NH4+ were the major cations with VWM values of 108.3 mu eq/L and 88.4 mu eq/L. Sum of Ca2+ and NH4+ accounted for 25%-94% of the total cations. Analysis of the seasonal variations of the pH showed that the rainwater was more acidized in summer than in the other seasons. Investigations of neutralization factors (NFs) indicated that the acidity of rainwater in winter and spring was neutralized by NH4+ and Ca2+. Studies of the origins of major ions showed that SO42- and NO3- were from coal combustion and fossil fuels, and Na+ and Cl- were from sea sources, while Ca2+, Mg2+ and K+ were from the continental sources. The delta S-34 values of SO42- in rainwater ranged from -2.1%. to 6.1 parts per thousand (mean value of 2.1%). The delta S-34 values of SO42- in winter were much higher than those in other seasons. Analysis of the delta S-34 values vs. SO42- of rainwater combined with air mass trajectory showed that atmospheric sulfur at TGR was mainly associated with coal combustion and fossil fuels. The lower delta S-34 values in summer at TGR could be explained by higher contribution of biogenic sulfur.
关键词	Major Ions Sulfur Isotope Acid Rain Three Gorges Reservoir
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/5969
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Qixin Wu,Guilin Han. Sulfur isotope and chemical composition of the rainwater at the Three Gorges Reservoir[J]. Atmospheric Research,2015,155(1):130-140.
APA	Qixin Wu,&Guilin Han.(2015).Sulfur isotope and chemical composition of the rainwater at the Three Gorges Reservoir.Atmospheric Research,155(1),130-140.
MLA	Qixin Wu,et al."Sulfur isotope and chemical composition of the rainwater at the Three Gorges Reservoir".Atmospheric Research 155.1(2015):130-140.

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