Surface water samples from six (6) sampling stations of Lake Alau were monitored for
seasonal variations of electrochemical parameters, pH, redox potential (Eh) and
electrical conductivity (EC). Sampling stations were located on the basis of outlets to
water treatment plant and irrigation, points of water collections for domestic use by
residents around the Lake Area. Determinations were conducted on-site with Jenway
portable meters. Results of determinations show a general increase in the levels of pH
during the dry season period with an average value of 8.0±0.1, tending towards an
alkaline surface water environment. The general increase in pH level during the dry
season was statistically significant. However, the means of Eh (181.0±11.3 and
209.8±11.5 mV) were recorded for dry and wet seasons respectively. EC on the other
hand was higher in the dry season than the wet season, with mean conductivities of
125.6±10.6 and 169.5±11.0 µS cm-1 respectively. In conclusion, the results of the
electrochemical measurements obtained in this study show that Lake Alau is within the
no problem limits. However further monitoring studies are needed to elucidate the extent
of pollution in terms of toxic heavy metals and certain persistent organic pollutants.