Influence of crustal aerosols on wet deposition at a rural site of North-East India

被引：7
作者：
Kulshrestha, Monika J. [1 ]
Singh, Ruchi [1 ]
Duarah, R. [2 ]
Rao, P.G. [2 ,3 ]
机构：
[1] CSIR-National Physical Laboratory, New Delhi
[2] CSIR-North East Institute of Science and Technology, Jorhat
[3] University of Science and Technology, Meghalaya
来源：
International Journal of Environmental Studies | 2014年 / 71卷 / 04期
关键词：
Acid rain; Major ions; Nitrate; pH; Sulphate;
D O I：
10.1080/00207233.2014.942151
中图分类号：
学科分类号：
摘要：
A total of 42 rain water samples were collected for a period of one year, March 2005 to February 2006, at Jorhat, a rural site of North-East India. The pH of the samples varied from 4.1 to 7.1 with a mean 5.5 showing the acidic nature of rainwater with reference to 5.6 (natural pH of rain water due to CO2 equilibrium in the atmosphere). More than 50% of the rain events have been found to be acidic. Mean concentrations of major ions in the rain water followed the order SO > Ca2+ > NH > NO > PO > H+ > HCO > Na+ > Mg2+ > Cl- > K+ > F-. Ca2+, NH and Mg2+ have shown a neutralization factor less than 1, indicating partial neutralization of anions. EFSoil indicated that soil plays a major role in rain water composition. Maximum concentration for most of the ionic species has been observed during winter followed by summer, post-monsoon and monsoon periods, respectively. Occurrence of acid rain events has been observed throughout the year suggesting that the soil is acidic. © 2014 © 2014 Taylor & Francis.
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页码：510 / 525
页数：15
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