A review of chemical status of the Weija Lake

  • G.K. Ameka Department of Botany, University of Ghana, P.O. Box LG 55, Legon
  • K.A.A. De Graft-Johnson Water Research Institute, C.S.I.R., P.O. Box 38, Achimota
  • R.K. Akuamoah Department of Chemistry, University of Ghana, P.O. LG 56, Legon


Weija lake, a man-made lake, was sampled in 1993 at different sites along the lake. The water was slightly alkaline and the temperatures reflected the generally high tropical temperatures and fluctuated with the seasons. The dissolved oxygen concentration was high and varied from site to site being lower at sites with high organic matter. The mean transparency was 60 cm. The dominance pattern for nitrogen compounds for the lake was NO3- ¾ N > NH3 ¾ N > NO2- ¾ N while the ionic pattern was Na2+ > Mg2+ > Ca2+ > K+: HCO3- > Cl- > SO42-. The cation dominance pattern of the lake was similar to sea water near the estuary, but the present study and previous work indicate that the proportions of ions (cations and anions) are changing to that of fresh water.

JOURNAL OF THE GHANA SCIENCE ASSOCIATION Volume 2 No. 2 (2000) pp. 136-147

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eISSN: 0855-3823