Water Quality Assessment of Groundwater Resources in Qaleeh Shahin Plain Based on Cd and HEI

Document Type : Original Article


1 Research Center of Environmental Pollutants, Qom University of Medical Sciences, Qom, Iran

2 Department of Environment, School of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran


Aims The chemical elements in water resources, especially groundwater, can affect the
water consumption purposes. The aim of this study was to evaluate the status of the overall
pollution level of ground water of Qaleeh Shahin plain with respect to heavy metals by Cd and
HEI methods.
Instrument & Methods This cross-sectional semi-experimental study was conducted
in Sarpol-e Zahab township in Kermanshah Province, west of Iran. For this purpose, 20
groundwater wells were chosen randomly. The samples were filtered (0.45μm), stored in
polyethylene bottles and were acidified at a pH lower than 2 by adding concentrated HNO3
in order to avoid metal adsorption onto the inner bottle walls. Element concentrations were
determined using ICP-OES. The correlation between the metals in the different seasons,
between the indices values and concentration of metals and between different indices values
was assessed by Pearson’s correlation coefficient.
Findings There were no significant correlations between the concentrations of the elements
in 2 seasons except between As and Cd in winter (r=0.544; p<0.05). Only the concentration of
Pb had significant correlations with Cd (r=0.937; p=0.0001) and HEI (r=0.997; p=0.0001) values
in winter and with Cd (r=0.997; p=0.0001) and HEI (r=0.810; p=0.0001) values in summer,
which indicated Pb as the main contributory pollutant. The correlation between Cd and HEI was
significant in winter (r=0.943; p=0.0001) and was significant in summer (r=0.818; p=0.0001).
Conclusion The water resources of Qaleeh Shahin plain, Kermanshah Province, Iran, are not
polluted by heavy metals and are suitable for drinking.