A study on chemical composition of atmospheric precipitation at Savar, Joydevpur, Tongi and Narayanganj, Bangladesh

Precipitation was collected on an event basis from July 1994 to August 1995 at towns around the capital Dhaka of Bangladesh. The major chemical components were determined by atomic absorption spectrophotometry, UV-Visible spectrophotometry and ion selective electrode method. The concentrations of nitrate and sulphate were found to be below the minimum detection limit of 1.0 mg L-1; the concentrations of Cl-, Na+, K+, Ca+2, Mg+2 and NH4+ ranged from <1.0-3.03, 0.14-1.70, 0.04-0.37, 0.04-1.30, <0.02-0.20 and <0.10-2.33 mg L-1, respectively. The values of pH and conductivity ranged from 4.80-6.74 and 3.3-37.5 mu S cm(-1),respectively.