Publisher: Bachudo Science Co. Ltd

The Use of Anion Geochemistry In Mapping Groundwater Facies In The Port Harcourt Area of The Niger Delta, Nigeria

P. Amadi Abi-bezam, C.e., Egboka Boniface
KEYWORDS: Anion facies, Hand-dug well, Mappable, Acidity, Sulphate reduction

ABSTRACT:

The groundwater system of the Port Harcourt area is home to three anion facies, the Cl – SO4, the Cl – SO4 – HCO3 and the HCO3 – Cl – SO4. The first two types exist in both shallow – and deep – groundwater environments while the third is restricted to the deep environment. Although there are natural intermittent and, in some cases, continuous interactions between shallow and deep groundwaters, this paper establishes that the quality and facies types of the groundwaters are not exactly alike. 28 groundwater samples (12 from hand-dug wells; 16 from boreholes) were analysed for Cl, SO4, HCO3 and CO3. The concentration levels of SO4 2- were analysed using the HACH Spectrophotometer equipment, model No DR/2000 while those of Cl-, CO3 2- and HCO3 - were by titrimetric method, using the Titro Process Dosimat 665 equipment. The results indicate that, for the hand-dug wells, SO4 2- levels ranged from 0.00mg/l to 67.0mg/l with an average of 16.5mg/l; HCO3 - from 12.2 to 36.6 with an average of 15.25, while Cl- ranged from 11.332 to 121.905 with an average of 41.22mg/l. No CO32- was detected in all the samples. For the borehole samples, the respective figures for SO4 2-, HCO3 - and Cl- are 0.00 to 33.0 with an average of 2.13; 12.2 to 24.4 with an average of 12.96, and 5.490 to 72.306 with an average of 17.037%2


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