نویسنده: Banerjee، D؛
Summer2008,Volume5 - Number3 (8 صفحه - از 331 تا 338)
The growing trend of industrialization has marked impact on the atmospheric chemistry around the globe. Such impacts are also predicted for developing countries like India. Acid precipitation due to secondary pollutantsis one of them. The present investigation was conducted with an aim of studying the precipitation chemistry overAsansol city, India during the monsoon season. The rain water samples, collected on event basis during the period ofJune to September 2006, were analyzed for HCO3-, Cl-, SO42-, NO3- , NH4+, K+, Na+, Mg2+, Ca2+ and pH using standard procedures. The study revealed that the precipitation was alkaline in nature with mean pH value of 6.08. Dominantanion in rain water samples was HCO3- (36 %), whereas Ca2+ was highest among the cations (53 %). The observed acidic events, based on pH value, were only 17 %, indicating the alkaline components effectively neutralize rain water overthe area. This was also supported by the total alkaline to acid ion ration of 1.05. The ratio of (NO3-+Cl-) and SO42- was>1, indicating that acidic properties were influenced by HNO3 and HCl. In the ratio between (Ca2++NH4+) and(NO3-+SO42-), values >1 were obtained, indicating significant alkaline influence, which effectively prevented aciddepositions in the area.
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