Chemical Composition of Wet Precipitation in Ibadan, Nigeria

Rainwater samples were collected for four two-weekly periods at nine sampling points in the city of Ibadan, Nigeria, during May-July, 1999, and analysed for pH, sulphate, nitrate, chloride, phosphate, sodium, potassium, calcium, and magnesium. The rainwater was predominantly neutral with pH values ranging between 5.8 and 7.0, and averaging 6.60.3. Average concentrations (eq/L) for all the sampling points and sampling periods were: SO42- (4622), NO3- (1.60.3), Cl- (1113), PO43- (3.21.8), Na (11.77.9), K (5.64.4), Ca (3026), and Mg (1.28.8). Concentrations of the various ions in the rainwater decreased slightly with the progress of the sampling period. The deposition flux (kg km-2 month-1) was estimated as: SO42- (390), NO3- (16.8), Cl- (67.6), PO43- (17.5), Na (46.6), K (37.9), Ca (104), and Mg (21.5). (Bulletin of The Chemical Society of Ethiopia: 2002 16 (2): 141-148

Daytime atmospheric sulphur dioxide concentrations in Ibadan city, Nigeria

Atmospheric sulphur dioxide concentrations were determined at 27 locations in the city of Ibadan, Nigeria, during May-June 1997. The locations were chosen from zones of high and low traffic densities, residential areas, industrial areas, and remote (control) areas. Sulphur dioxide levels did not significantly vary with the time of day of sampling, which was between 9 a.m. and 5 p.m. Average levels were: high and medium traffic density zones, 34.8 mg/m3; low traffic density and residential zones, 20.0 mg/m3; industrial zones, 68.9 mg/m3; and control zones, 14.5 mg/m3. The average level for all the zones, 34.1 mg/m3, is within the limits of worldwide guidelines for air quality, but slightly higher than prevailing levels in some cities of the developed countries. (Received January 5, 2001; revised July 10, 2001)(Bulletin of The Chemical Society of Ethiopia: 2003 15 (1): 71-78

<b>Chemical composition of wet precipitation in Ibadan, Nigeria</b>

Rainwater samples were collected for four two-weekly periods at nine sampling points in the city of Ibadan, Nigeria, during May-July, 1999, and analysed for pH, sulphate, nitrate, chloride, phosphate, sodium, potassium, calcium, and magnesium. The rainwater was predominantly neutral with pH values ranging between 5.8 and 7.0, and averaging 6.6 plus or minus 0.3. Average concentrations (&mu;eq/L) for all the sampling points and sampling periods were: SO₄^2- (46 plus or minus 22), NO₃^- (1.6 plus or minus 0.3), Cl^- (11 plus or minus 13), PO₄^3- (3.2 plus or minus 1.8), Na (11.7 plus or minus 7.9), K (5.6 plus or minus 4.4), Ca (30 plus or minus 26), and Mg (1.2 plus or minus 8.8). Concentrations of the various ions in the rainwater decreased slightly with the progress of the sampling period. The deposition flux (kg km^-2 month^-1) was estimated as: SO₄^2- (390), NO₃^- (16.8), Cl^- (67.6), PO₄^3- (17.5), Na (46.6), K (37.9), Ca (104), and Mg (21.5)