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Home  >  Volume 35

Estimation of the Salinity of Choba River, Port Harcourt Using a Self Constructed Electrical Conductivity Meter by P.I. Enyinna and F.U. Nte (pages 295-300)
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In line with the Federal Government of Nigeria’s policy on local production and University of Port Harcourt’s entrepreneurial disposition, we went into local production of conductivity meter which can effectively measure water salinity. This meter was constructed using, 10 V ac to dc power supply, resistors, vero board, copper electrodes and multi meter. The electrical connections were strictly carried out following circuit illustrations. The meter was used to measure the conductivity of 20 water samples collected from Choba River in Port Harcourt, and five tap water samples from the same community. The salinity or total dissolved salts (TDS) of the samples was computed from the sample conductivities. The results showed that the TDS ranged between 11.36 mg/l and 24.85 mg/l and were found to be high when compared to the measured average conductivity of tap water (5.19 mg/l) from the same surveyed area. These results are in the same range with previous measurements. Also, both the measured conductivity and TDS of the samples are low compared to the standard limits of 1000 μS/cm and 500 mg/l respectively, indicating that the surveyed river may not be highly mineralised since the conductivity and thus TDS of water depend on its mineral content. The measured results using constructed meter when compared with the results using standard meter showed percentage deviation range of between – 0.35 % and 0.19 %. The close agreement in the 2 sets of results is an indication that the constructed conductivity meter can serve as an effective meter for the measurement of salinity of water bodies.

Keywords: Salinity, Choba river, Self- constructed, Conductivity meter.