Investigation into atmospheric deposition through precipitation studies at New Delhi (India)

Rain water samples were collected during the monsoon of 1994, using automatic wet-only and manual bulk collectors at a height of 30 m above the ground at the National Physical Laboratory, New Delhi. The average pH of the rain water was 5.7 and its chemical composition was dominated by NH 4 and SO 4....

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Bibliographic Details
Published in:Atmospheric environment (1994) 1996, Vol.30 (24), p.4149-4154
Main Authors: Kulshrestha, U.C., Sarkar, A.K., Srivastava, S.S., Parashar, D.C.
Format: Article
Language:English
Subjects:
Applied sciences
Dust
Exact sciences and technology
Natural water pollution
Pollution
Q1
Rainwaters, run off water and others
Sulfur compounds
Water analysis
Water treatment and pollution
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Summary:Rain water samples were collected during the monsoon of 1994, using automatic wet-only and manual bulk collectors at a height of 30 m above the ground at the National Physical Laboratory, New Delhi. The average pH of the rain water was 5.7 and its chemical composition was dominated by NH 4 and SO 4. The free acidity of the rain water was found to be due to S04 rather than N03 and it was mainly neutralized by NH 4 and Ca. Calculation of sea salt fraction and enrichment factor revealed that this site is free for marine influence. On an average the bulk samples had 13% higher concentration than that of wet-only samples which may be due to the deposition of soil-derived particles during the 24 h period of exposure. The higher neutralization factors of Ca and Mg in bulk samples and highest dry deposition rates for Ca in comparison to other components, indicated the positive interference of dust particles in neutralization.
ISSN:1352-2310
1873-2844
DOI:10.1016/1352-2310(96)00034-9