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Analysis of Wet Precipitation of Air Pollutants in Mumbai (India)
Authors:Rekha Thakre  S D Joshi
Institution:(1) Land Environment Management Division, India;(2) Air Pollution Control Division, National Environmental Engineering Research Institutie, Nagpur, 440 020, India
Abstract:Bulk precipitation samples at Mumbai (India) were collectedduring the monsoon seasons of 1991 to 1996 and analysed forionic concentrations using an Ion Chromatograph DIONEX model100. The variability of sulphate to nitrate ratio in rainwaterfluctuates in a wide range from 1.5 to 20 and governed by thesulphate concentrations in the sample. The regression analysisof the data reveals that in the bulk precipitation at Mumbai, SO4 2- is becoming increasingly important relative toNO3 -. The role of meteorological influences onscavenging of air pollutants by rain water has been tried toexplain the phenomena. The computed wet deposition rates for Sand N during 1991–1996 show that the S deposition is higherthan N in all the years. There is a wide fluctuation indeposition rates of S ranging from 2 to 55 kg km2 per annum.
Keywords:ionic deposition  temporal variation  wet precipitation
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