HYDRO-CHEMICAL ASSESSMENT OF GROUNDWATER QUALITY WITHIN ILORIN NW SHEET 223, SOUTH-WESTERN NIGERIA
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Date
2022-06-22
Journal Title
Journal ISSN
Volume Title
Publisher
Proceedings of First International Conference of theNigerian Society of Economic Geologists (NSEG)
Abstract
The assessment of groundwater quality within Ilorin NW, Sheet 223 using physico–chemical
indices has been carried out. The study assesses quality of groundwater in the area for
domestic and agricultural purposes by insitu measurement of its physical parameters;
laboratory analysis of its chemical parameters and assessment of levels of some hazard
parameters for irrigation quality. The physical parameters which include colour, turbidity, pH,
temperature and electrical conductivity were measured by insitu method using HANA Model
HI83200 Multimeter while the chemical parameters which are (Ca2+), (Na+
), (K+
), (Mg2+)
,(Cu2+), (Fe2+), (Mn+
), (Zn+
),( Pb2+),(Cd+
),(SO4
-
),(PO4
-
) (Cl-
) , (HCO3
-
) , (CO3
-
) , and (NO3
-
)
were analysed by rock chemical composition determination methods at the University of
Ilorin Central Research Laboratory. The parameters assessed for irrigation purpose include
Residual Sodium Carbonate (RSC), Sodium Adsorption Ratio (SAR), Salinity Hazard, Toxic
Elements Hazard and Kelley‘s Index (K.I) using specified chemical equations. The result of
the physical parameters measured shows average concentrations of 5 (TCU), 182.3 (NTU),
5.8, 31.290C and 359.14 (µS/cm) respectively, the laboratory analysis of chemical parameters
indicates average concentrations of 0.85, 1.23, 0.35, 0.56, 0.03, 0.1, 0.02, 0.03, 0.05, 0.02,
0.11, 1.43, 65, 157, 123 and 0.47 (all in mg/l) respectively and the parameters calculated for
irrigation quality revealed unsuitable (RSC), Excellent (SAR), medium salinity hazard, low
toxic elements and suitable K.I. The major water types based on piper trilinear plot are
Sodium–potassium bicarbonate and Calcium bicarbonate. Conclusively, the result of the
physico–chemical assessment of groundwater samples in the area shows values that fall below
the maximum desirable and permissible limits of World Health Organization (WHO)
standard; suggesting that the groundwater is good for human consumption. It was also
observed that the suitability of groundwater in the area for irrigation purpose is of excellent to
good quality based on irrigation quality assessed parameters
Description
This is an Hydrochemical article focusing on Groundwater Quality assessment