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Proceedings of the International Academy of Ecology and Environmental Sciences, 2011, 1(1):26-35
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Article

Study on mixing ratio of atmospheric ammonia and other nitrogen components

S.K. Sharma1 , H. Pathak2, A. Datta1, M. Saxena1, T. Saud1, T.K. Mandal1
1Radio and Atmospheric Sciences Division, National Physical Laboratory, Council of Scientific and Industrial Research (CSIR), Dr. K S Krishnan Road, New Delhi-110 012, India; 2Division of Environmental Sciences, Indian Agricultural Research Institute, New Delhi-110 012, India

Received 8 March 2011; Accepted 5 April 2011; Published online 10 May 2011
IAEES

Abstract
Mixing ratios of atmospheric NH3, NO and NO2 were measured during September-October 2008 and September-October 2009 over Delhi to study their variation and possible sources in respect of meteorological condition. Mixing ratio of atmospheric NH3 ranges from 1.05 ¨C 39.26 ppbv with an average value of 17.47 ¡À 3.25 ppbv during 2008. The average mixing ratio of atmospheric NH3 was increased by 7.2% during 2009 over that of 2008. The average mixing ratio of NO2 during 2008 recorded as 4.46 ¡À 1.26 ppbv with ranges between 1.05 ¨C 16.06 ppbv. Significantly higher (P<0.05) NO2 mixing ratio was recorded during 2008. Early morning increase in NO2 mixing ratio may be attributed to conversion of NO to NO2 with the interaction of O3. Diurnal and day-to-day variations in mixing ratio of atmospheric NH3, NO and NO2 were observed during the study. Result reveals that the mixing ratio of atmospheric NH3 is correlated with NO (r2 = -0.86), NO2 (r2 = 0.35), relative humidity (r2 = ¨C0.87) and ambient temperature (r2 = 0.88).

Keywords atmospheric NH3; NO; NO2; chemiluminescence method; diurnal variation.


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