Chemical composition and acidity of precipitation: A monitoring program in northeastern Vietnam

被引:7
作者
Viet, PH
Tuan, VV
Hoai, PM
Anh, NTK
Yen, PT
机构
[1] Hanoi Univ Sci, Ctr Environm Chem, Hanoi, Vietnam
[2] Inst Hydrol & Meteorol, Hanoi, Vietnam
关键词
acidity; chemical composition; dry deposition; northeastern Vietnam; rainwater;
D O I
10.1023/A:1013989703593
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Rainwater has been sampled weekly from five sites (Dos. 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. Ca (2+) and SO42- were generally found as predominant in both rainwater and aerosol. SO2 and NH3 in Hanoi and Hoabinh were monitored out of corresponding environmental features.
引用
收藏
页码:1499 / 1504
页数:6
相关论文
共 11 条
[1]   Acid deposition in Hong Kong [J].
Ayers, GP ;
Yeung, KK .
ATMOSPHERIC ENVIRONMENT, 1996, 30 (10-11) :1581-1587
[2]   FACTORS CONTROLLING THE ACIDITY OF NATURAL RAINWATER [J].
CHARLSON, RJ ;
RODHE, H .
NATURE, 1982, 295 (5851) :683-685
[3]   Regional background acidity and chemical composition of precipitation in Thailand [J].
Granat, L ;
Suksomsankh, K ;
Simachaya, S ;
Tabucanon, M ;
Rodhe, R .
ATMOSPHERIC ENVIRONMENT, 1996, 30 (10-11) :1589-1596
[4]   Analysis of aerosol composition at Cheju Island, Korea, using a two-bin gas-aerosol equilibrium model [J].
Hayami, H ;
Carmichael, GR .
ATMOSPHERIC ENVIRONMENT, 1997, 31 (20) :3429-3439
[5]   CASE-STUDIES ON THE CHEMICAL-COMPOSITION OF FOGWATER - THE INFLUENCE OF LOCAL GASEOUS EMISSIONS [J].
JOHNSON, CA ;
SIGG, L ;
ZOBRIST, J .
ATMOSPHERIC ENVIRONMENT, 1987, 21 (11) :2365-2374
[6]   CHEMICAL-COMPOSITION OF RAIN IN THESSALONIKI, GREECE, IN RELATION TO METEOROLOGICAL CONDITIONS [J].
SAMARA, C ;
TSITOURIDOU, R ;
BALAFOUTIS, C .
ATMOSPHERIC ENVIRONMENT PART B-URBAN ATMOSPHERE, 1992, 26 (03) :359-367
[7]  
VIET PH, 1998, P 4 M IGAC DEBITS PR
[8]   On the origin and the trend of acid precipitation in China [J].
Wang, WX ;
Wang, T .
WATER AIR AND SOIL POLLUTION, 1995, 85 (04) :2295-2300
[9]   On acid rain formation in China [J].
Wang, WX ;
Wang, T .
ATMOSPHERIC ENVIRONMENT, 1996, 30 (23) :4091-4093
[10]   AN ANALYSIS OF PRECIPITATION CHEMISTRY MEASUREMENTS IN SHIMANE, JAPAN [J].
YAMAGUCHI, K ;
TATANO, T ;
TANAKA, F ;
NAKAO, M ;
GOMYODA, M ;
HARA, H .
ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS, 1991, 25 (02) :285-291