Statistical Modeling of Ambient Air Pollutants in Delhi     

Chelani  Asha B.  Gajghate  D. G.  Tamhane  S. M.  Hasan  M. Z. 《Water, air, and soil pollution》2001,132(3-4):315-331

State space model coupled with Kalman filter is used toforecast metal concentrations observed at Delhi. Three metalsviz. Lead, Iron, Zinc along with Respirable SuspendedParticulate Matter (RSPM) Concentration observed during 1993to 1995 are selected for the study. The data for year 1996is selected to test the forecasting ability of the model.Wind speed is used as an external input. Autoregressive modelwith external input is also used to compare the results. Itis found that the State space model is giving betterpredictions for lead, iron and RSPM concentration than theARX model while for zinc concentration, both the models aregiving good performance results.  相似文献   

Removal of chromium (VI) as chromium diphenyl carbazide (CDC) complex from aqueous solution by activated carbon     

D. G. Gajghate  E. R. Saxena  A. L. Aggarwal 《Water, air, and soil pollution》1992,65(3-4):329-337

Adsorption of Cr (VI) as CDC-complex from aqueous solution by activated C has been investigated. Factors like pH and presence of Cr (III) which affect the adsorption of CDC-complex were studied. The increase in particle size and surface area of activated C does not enhance the removal of CDC-complex. For different concentrations of Cr, the optimum quantity of Diphenyl Carbazide has been determined. The reduced Cr e.g. Cr (III) decreases the CDC-complex removal. The Langmuir and Freundlich isotherms constant as calculated are γm=1.8932 and b=0.2305 and n=0.036, log K=0.0266, respectively.  相似文献