Progressive Changes in Physicochemical Constituent of Rainwater: A Case Study at Oyoko, a Rural Community in Ghana

Authors: J. O. Yeboah, K Aboraa, K. Kodom

Abstract:

The chemical and physical characteristics of rainwater harvested from a typical rooftop were progressively studied. The samples of rainwater collected were analyzed for pH, major ion concentrations, TDS, turbidity, conductivity. All the Physicochemical constituents fell within the WHO guideline limits at some points as rainfall progresses except the pH. All the components of rainwater quality measured during the study showed higher concentrations during the early stages of rainfall and reduce as time progresses. There was a downward trend in terms of pH as rain progressed, with 18% of the samples recording pH below the WHO limit of 6.5-8.0. It was observed that iron concentration was above the WHO threshold value of 0.3 mg/l on occasions of heavy rains. The results revealed that most of physicochemical characteristics of rainwater samples were generally below the WHO threshold, as such, the rainwater characteristics showed satisfactory conditions in terms of physicochemical constituents.

Keywords: Conductivity, pH, physicochemistry, rainwater quality, TDS.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1107091

References:

[1] Olobaniyi S B and Efe S I (2007), Comparative assessment of rainwater and groundwater quality in an oil producing area of Nigeria: environmental and health implications, (6) 2.
[2] Mohammad, Z. I, (2003), Impact of Atmospheric Aerosols on the Composition of Rainwater Leading To Ecosystem Damage in Northeastern Iowa, Department of Earth Science University of Northern Iowa Cedar Falls, Iowa 50614.
[3] Olobaniyi S B and Owoyemi, FB (2004). Quality of Groundwater in the Deltaic Plain Sands aquifer of Warri and environs, Delta State, Nigeria. Water Resources- Journal of the Nigerian Ass. Hydrogeologists, 15, 38- 45.
[4] ISO/IEC, 17025 International Standard General requirements for the competence of testing and calibration laboratories, ISO/IEC 2005
[5] Ceron et al (1992), Chemical composition at the end of the mid – summer drought in the Caribbean shore of the Yucatan Peninsula. (4)4 pp6-13.
[6] Sigg L. Stumm, W. Zobrist, J. and Zurdren, F. (1987) The chemistry of log factors regulating its compositon. Chimia 41, 159- 165.
[7] Tebbutt, T H Y, (1983), Principles of water quality control, 3rd edition, Pergamon Press.
[8] Daifullah, A.A M, and Shakour, A.A (1998), Chemical composition of rainwater in Egypt. Electronic Version, (Accessed August 2008).
[9] Harrison, R.M and De Mora, S J (2002), Introductory chemistry for the Environmental Sciences 2nd edition. Cambridge University press.pp267-277.