Seasonal variation and sources of low molecular weight organic acids in precipitation in the rural area of Anshun

Zhang, Yan Lin; Lee, Xin Qing; Cao, Fang; Huang, Dai Kuan (2011). Seasonal variation and sources of low molecular weight organic acids in precipitation in the rural area of Anshun. Chinese science bulletin, 56(10), pp. 1005-1010. Beijing (China): Science in China Press 10.1007/s11434-011-4411-5

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Low mol. wt. (LMW) org. acids are important and ubiquitous chem. constituents in the atm. A comprehensive study of the chem. compn. of pptn. was carried out from June 2007 to June 2008 at a rural site in Anshun, in the west of Guizhou Province, China. During this period, 118 rainwater samples were collected and the main LMW carboxylic acids were detd. using ion chromatog. The av. pH of rainwater was 4.89 which is a typical acidic value. The most abundant carboxylic acids were formic acid (vol. wt. mean concn.: 8.77 μmol L-1) and acetic acid (6.90 μmol L-1), followed by oxalic acid (2.05 μmol L-1). The seasonal variation of concns. and wet deposition fluxes of org. acids indicated that direct vegetation emissions were the main sources of the org. acids. Highest concns. were obsd. in winter and were ascribed to the low winter rainfall and the contribution of other air pollution sources northeast of the study area. The ratio of formic and acetic acids in the pptn. ([F/A]T) was proposed as an indicator of pollution source. This suggested that the pollution resulted from direct emissions from natural or anthropogenic sources. Comparison with acid pptn. in other urban and rural areas in Guizhou showed that there was a decreasing contribution of LMW org. acids to free acidity and all anions in rainwater from urban to remote rural areas. Consequently, it is necessary to control emissions of org. acids to reduce the frequency of acid rain, esp. in rural and remote areas. [on SciFinder(R)]

Item Type:

Journal Article (Original Article)


08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP)

UniBE Contributor:

Zhang, Yanlin




Science in China Press




Factscience Import

Date Deposited:

04 Oct 2013 14:27

Last Modified:

17 Mar 2015 21:10

Publisher DOI:


Web of Science ID:


URI: (FactScience: 215561)

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