Experimental and Parameterization Method for Evaluation of Dry Deposition of S Compounds to Natural Surfaces
- 1 Department of Applied Sciences, Technical College, Agra, India
- 2 Department of Chemistry, Faculty of Science, Dayalbagh Educational Institute, Agra, India
Abstract
This paper deals with parameterization method based on meteorological parameters for calculation of dry deposition of S compounds on natural surface (leaf of Cassia siamea) and direct measurement method. A scheme based on meteorological parameters has been evolved to calculate the dry deposition theoretically and a computer program has been developed. Experimentally dry deposition flux of S on leaf of Cassia siamea was measured by exposing the leaf surfaces on non-dewy, non-foggy and non rainy days and washing the leaf surfaces with deionised water and samples were analyzed by Dionex Dx-500 Ion Chromatograph. Atmospheric concentration of SO 2 was 3.54±1.41 μg m -3 and particulate SO4 2- was 2.72±1.15 μg m -3 . Theoretically obtained dry deposition velocity of SO 2 and SO4 2- are 0.32 cm s -1 and 0.75cm s -1 , respectively. The calculated deposition of S as total sulphate (gaseous SO 2 and particulate SO4 2- ) to Cassia leaf was 2.05±0.78mg m -2 d -1 and experimentally obtained dry deposition of S as sulphate was 1.07±1.35 mg m -2 d -1 . The experimentally and theoretically obtained mean values for S as SO4 2- are comparable.
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