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Please use this identifier to cite or link to this item: http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/7173

Title: Chemical composition and acidity of precipitation: A monitoring program in Northeastern Vietnam
Authors: P.H., Viet
V.V., Tuan
P.M., Hoai
N.T.K., Anh
P.T., Yen
Keywords: Acidity
Dry deposition
Chemical composition
Northeastern Vietnam
Rainwater
Issue Date: 2001
Publisher: Water, Air, and Soil Pollution
Citation: Volume 130, Issue 1-4 III, Page 1499-1504
Abstract: Rainwater has been sampled weekly from five sites (nos. 1-5) in northeastern Vietnam in the period of May 1997 to Apr. 2000 (except Hoabinh site, from Aug. 1999 to Apr. 2000). Since Aug. 1999, weekly dry deposition samples including acidic gas and aerosol have been additionally collected at Hanoi (no. 4) and Hoabinh (no. 5) using filter pack system. In general, the pH in rainwater was frequently higher than 5.0. However, the trend of lower pH was observed during the winter and the beginning of autumn (from Nov. to Apr.). Interestingly, the highest frequency of the acidifying rainwater (32 %) and the lowest pH value (min. pH = 4.0) were observed in Hoabinh site. Acidic pH of rain water was also observed in Viettri (no. 3) and Hanoi (no. 4), indicating the local effects of human and industrial activities. Ca2+ and SO4 2- were generally found as predominant in both rainwater and aerosol. SO2 and NH3 in Hanoi and Hoabinh were monitored out of corresponding environmental features.
URI: http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/7173
ISSN: 496979
Appears in Collections:2001-2005 VNU-DOI-Publications

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