Investigation of groundwater iron using electrical resistivity tomography in Yenagoa, Bayelsa State, Nigeria

This study attempted using electrical resistivity tomography in investigating groundwater iron. A lot of studies have been conducted in the area with different approaches such as 1D resistivity and hydrogeochemical approaches which, off course, led to the adoption of this method of investigating groundwater iron. Wenner configuration was used in the field and a minimum spread of 100m was employed. The data interpretation was done with Res2divn software. The value of resistivity has a range of 14.2Ωm to 37.9Ωm in the topsoil, figure2.Below this layer, the resistivity increased equal to 100Ω or more and a further depth to more than 296Ωm suggestive of sandy material and aquifereous layer. However, in other location figure 7, the resistivity was very high right from the topsoil with a range of 118Ωm to 498Ωm suggestive of sandy material overling the aquifer and meaning less concentration of groundwater iron.The 2-D resistivity tomography was able to depict the variability of iron concentration within a given locality. This was identified from the high hetereogenity of the subsurface.