{"title":"Background trends of pH of precipitation over India","authors":"G.S. Varma","doi":"10.1016/0004-6981(89)90476-9","DOIUrl":null,"url":null,"abstract":"<div><p>Background trends of rainwater pH have been examined at ten BAPMoN stations in India for the period 1974–1984. The highest frequency of pH was observed in the range 6.5–7.0. The 621 pH values recorded were all lying between 5.18 and 9.00. At most of the stations the pH trend is decreasing towards the acid range. The overall probability of occurrence of acid rain was found to be about 2% (pH < 5.6). Very high pH values have also been observed at some stations, specially at Jodhpur, Allahabad and Srinagar, due to incursions of soil particles rich in Ca<sup>2+</sup>, Mg<sup>2+</sup>, Na<sup>+</sup> and K<sup>+</sup> ions.</p></div>","PeriodicalId":100138,"journal":{"name":"Atmospheric Environment (1967)","volume":"23 4","pages":"Pages 747-751"},"PeriodicalIF":0.0000,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0004-6981(89)90476-9","citationCount":"22","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Atmospheric Environment (1967)","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0004698189904769","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 22
Abstract
Background trends of rainwater pH have been examined at ten BAPMoN stations in India for the period 1974–1984. The highest frequency of pH was observed in the range 6.5–7.0. The 621 pH values recorded were all lying between 5.18 and 9.00. At most of the stations the pH trend is decreasing towards the acid range. The overall probability of occurrence of acid rain was found to be about 2% (pH < 5.6). Very high pH values have also been observed at some stations, specially at Jodhpur, Allahabad and Srinagar, due to incursions of soil particles rich in Ca2+, Mg2+, Na+ and K+ ions.
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