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2-year study of chemical composition of bulk deposition in a south China coastal city: comparison with east Asian cities
- Source :
- Environmental sciencetechnology. 39(17)
- Publication Year :
- 2005
-
Abstract
- Using the emission strengths of the precursor gases, the nature of soil in China, the ventilation power and half value rainout region length, the nss-SO42-, NO3-, Ca2+, and NH4+ concentrations, and pH of rainwater at Hong Kong and other cities of China and Japan are compared and rationalized. The chemical composition of Hong Kong bulk deposition from 1998 to 2000 is taken from our collection and analysis of 156 daily samples. The volume-weighted average (VWA) pH is 4.2 over the whole study period. Nonsea salt- (nss-) sulfate is the most abundant species in the samples, and the pH mostly depended upon the concentrations of the major species nss-SO42, NO3-, Ca2+, and NH4+. All species concentrations show higher levels in the cold season (especially NO3- and Ca2+), which indicates the dominant dilution effects in the warm season due to heavy rainfall and the influence of the continental outflow of pollutants during the cold season. For Hong Kong bulk deposition, the VWA pH is slightly lower in the cold season, and there is a slight decrease in VWA pH over the period from 1994 to 2000. The impact of acid rain in Hong Kong is briefly discussed.
- Subjects :
- inorganic chemicals
China
Time Factors
Meteorology
Rain
Chine
Japan
Ammonia
Cations
medicine
Environmental Chemistry
East Asia
Cities
Chemical composition
Air Pollutants
Nitrates
Sulfates
food and beverages
General Chemistry
Seasonality
Hydrogen-Ion Concentration
medicine.disease
Rainout
Environmental science
Hong Kong
Calcium
Physical geography
Acid rain
Seasons
Deposition (chemistry)
Environmental Monitoring
Subjects
Details
- ISSN :
- 0013936X
- Volume :
- 39
- Issue :
- 17
- Database :
- OpenAIRE
- Journal :
- Environmental sciencetechnology
- Accession number :
- edsair.doi.dedup.....134e8433ddcd9ac4600fd6f18e72aa05