Abstract
Electrical resistivity method gives somewhat reliable results in hydrogeophysical deductions, in which the disposition of aquifers can be suitably deciphered. The present study was conducted to validate the use of geoelectric sounding in estimating total dissolved solids (TDS) in groundwater. Twenty (20) resistivity measurements obtained have been interpreted by curve matching and computer iteration and converted to formation resistivities and thicknesses. The resistivities of the aquifer delineated were subsequently used to estimate TDS in groundwater which was correlated with those derived from previous geochemical analyses of ten (10) groundwater samples taken near sounding locations. The result shows a strong correlation (R2 > 0.8) indicating that the TDS determined by geoelectric sounding and geochemical method give similar results.KEYWORDS: Total dissolved solid; groundwater; geoelectric; geochemical; aquifer
Highlights
Groundwater is a replenishable resource found in aquifer, it is a major source of fresh water which is generally used for domestic, industrial and agricultural purpose in many parts of the world
This finding is in agreement with that of Aweto et al (2015) who showed that mean total dissolved solids (TDS) of 269.77 mg/L derived from resistivity sounding correlated with mean TDS of 211.1 mg/L deduced from previous geochemical study by Aweto and Akpoborie (2011)
The results of this study shows that TDS level in groundwater estimated from geoelectric soundings were found to be well within permissible limits of 500 mg/L and as a result may be suitable for drinking purpose
Summary
Groundwater is a replenishable resource found in aquifer, it is a major source of fresh water which is generally used for domestic, industrial and agricultural purpose in many parts of the world. Water quality data may not be readily available mainly because the boreholes were completed without geochemical analyses In such instance geoelectric sounding may serve a useful purpose in estimating total dissolved solids (TDS). Electrical resistivity method is sensitive and can be used to determine groundwater quality (Kelly, 1976; Urish 1983; Mazac, et al, 1987) This is because the resistivity measured can provide useful information about the fluid in the voids within the rock matrix of an aquifer. This study was carried out in western Niger Delta with the objective of comparing and validating the use of geoelectric techniques in absence of geochemical techniques to identify potentially useable aquifer based on total dissolved solids concentration.
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