Chemical composition of rainwater in a karstic agricultural area, Southwest China: The impact of urbanization

	Chemical composition of rainwater in a karstic agricultural area, Southwest China: The impact of urbanization
	Qixin Wu; Guilin Han; Faxiang Tao; Yang Tang
	2012
发表期刊	Atmospheric Research
卷号	111 期号:1 页码:71-78
摘要	The chemical composition of rainwater has been studied in a karstic agricultural area, Southwest China. Rainwater pH and major ions were measured in samples collected from the town of Puding, Guizhou province, during the rainy season, between March and October 2008. The pH of samples varied between 4.6 and 7.1, with a volume-weighted mean (VWM) of 5.4. These relatively high-pH values do not signify a lack of acid components in the precipitation; instead, they demonstrate neutralization of acidity. Ca2+ and NH4+ were the dominant cations in the rainwater, with VWM concentrations of 156 and 33 mu eq/L, respectively. SO42- was the predominant anion, with a VWM concentration of 152 mu eq/L, followed by NO3- (17 mu eq/L). Our results show that most of the acidity in the collected samples was neutralized by Ca2+-rich alkaline soil dusts. We compared our findings with other areas of China that experience acid rain. The concentration of ions in Puding rainwater generally exceeded that reported in southern China but was lower than in northern China. This is probably due to karst rock desertification, which could provide the atmosphere with a source of alkaline dust. From back-trajectory analysis, correlation studies, and a comparison of major ion composition with other selected sites worldwide, we conclude that the rainwater ion composition of Puding is more significantly influenced by terrestrial and anthropogenic sources (mainly due to industrial and traffic emissions in surrounding large cities), rather than by marine sources.
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/352002/4835
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,Faxiang Tao,et al. Chemical composition of rainwater in a karstic agricultural area, Southwest China: The impact of urbanization[J]. Atmospheric Research,2012,111(1):71-78.
APA	Qixin Wu,Guilin Han,Faxiang Tao,&Yang Tang.(2012).Chemical composition of rainwater in a karstic agricultural area, Southwest China: The impact of urbanization.Atmospheric Research,111(1),71-78.
MLA	Qixin Wu,et al."Chemical composition of rainwater in a karstic agricultural area, Southwest China: The impact of urbanization".Atmospheric Research 111.1(2012):71-78.

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