A study on short-time sampling of individual rain events at New Delhi during monsoon, 1994 |
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| Authors: | U C Kulshrestha A K Sarkar S S Srivastava D C Parashar |
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| Institution: | 1. Chemistry Division, National Physical Laboratory, Dr K S Krishnan Road, 110 012, New Delhi, India
2. Department of Chemistry, Dayalbagh Educational Institute Dayalbagh, 282 005, Agra, India
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| Abstract: | Rain water samples of equal volume (50 mL) were collected from two couvective showers at New Delhi on 28 July and 23 August during the monsoon, 1994. The variation of constituents of both the showers showed different trends which might have been due to different antecedent periods. The first shower occurred after an antecedent period of 2–3 hours while the second shower occurred after a 14 day interval. The first shower had acidic pH (<5.6) and relatively higher concentration of NH4, SO4, NO3, Cl, F and K indicating insignificant below cloud scavenging. The second shower had alkaline pH (>5.6) and relatively higher concentrations of Ca and Mg. The higher concentration of Ca and Mg in the second shower were due to the loading with particulate matter during the preceding 14 days which made below cloud scavenging significant. |
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