Occurrence of Acid Rain over Delhi
Occurrence of Acid Rain over Delhi
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DOI：
10.1023/a:1017541809985
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发表时间：
2001-10
影响因子：
3
通讯作者：
S. Balachandran;P. Khillare
中科院分区：
文献类型：
--
作者：
S. Balachandran;P. Khillare
降水样本仅以湿降形式收集，并且主要基于 1995 年季风期间德里的事件。测定了主要阴离子（SO42-、NO3- 和 Cl-）和阳离子（Ca2+、Mg2+、Na+ 和 K+）的浓度。雨季雨水pH值大于5.6，呈碱性，但在季风后期，由于酸性离子缺乏适当的中和作用，pH值呈酸性。中和作用不仅是由于局部过程，还由于季风前的“Andhi”带来了含有Ca2+、Mg2+、Na+和K+的悬浮颗粒物（SPM）以及NH3的局部排放。季风后期，由于强降雨和邻近地区输送条件相对不利，阳离子浓度降低，而阴离子浓度由于持续排放而保持不变。
Precipitation samples were collected as wet-fall only andprimarily on event basis in Delhi during the monsoon period of1995. Concentrations of major anions (SO42-,NO3-and Cl-) andcations (Ca2+, Mg2+,Na+and K+) were determined. The pH of the rain waterwas found to be more than 5.6, showing alkalinity during theearly phase of monsoon, but during the late phase of monsoon pHtendency was towards acidity due to lack of proper neutralizationof acidic ions. Neutralization is not only due to the localprocess but also due to the pre-monsoon ‘Andhi’ which bringsSuspended Particulate Matter (SPM) containing Ca2+,Mg2+, Na+and K+as well as the local emission ofNH3. In the late monsoon the concentration of cations getsreduced because of heavy rainfall and relatively unfavourablecondition for their transport from the adjoining areas, whereasthe anion concentrations remain unchanged owing to theircontinuous emission.