Author(s)

Muhammad Kamran Khan¹, Waill Ayoub^2,3, Sumayya Saied¹, Mirza Muzammil Hussain^2,3, Saiyada Shadiah Masood⁴, Azhar Siddique⁵, Haider Abbas Khwaja^2,3*

¹Department of Chemistry, University of Karachi, Karachi, Pakistan.
²Wadsworth Center, New York State Department of Health, Albany, NY, USA.
³Department of Environmental Health Sciences, School of Public Health, University at Albany, Albany, NY, USA.
⁴Jinnah University for Women, Karachi, Pakistan.
⁵Unit for Ain Zubaida Rehabilitation & Groundwater Research, King Abdulaziz University, Jeddah, Saudi Arabia.

Inserting Groundwater quality variability and sources potentially contributing to aquifer recharge was evaluated in metropolitan Karachi. Selected sampling sites were characterized by large waste dumping sites, industrial zones, and the presence of open streams receiving heavy loads of industrial and domestic wastes. Levels of pH, electrical conductivity (EC), fluoride (F^-), chloride (Cl^-), bromide (Br^-), nitrate-N (NO^-₃-N), sulfate (SO^2-₄), sodium (Na⁺), potassium (K⁺), calcium (Ca²⁺), magnesium (Mg²⁺), and ammonium (NH⁺₄) were determined and compared with the WHO permissible limits. Concentrations of the measured ions were in the order of Cl^- > Na⁺ > SO^2-₄ > Mg²⁺ > Ca²⁺ > NO^-₃-N > K⁺ > F^- > Br^-. EC values were above the WHO guidelines, representing the presence of high ionic concentration in the groundwater. The health risk index (HRI) for indicated that inhabitants of Karachi are at risk of high exposure. Ingestion of high concentrations of NO^-₃-N in water can cause methemoglobinemia and birth defects. Results of multivariate statistical analysis, principal component analysis (PCA), cluster analysis (CA), and geographic information system (GIS) map analysis revealed that human activities are leading to adverse effects on the existing groundwater quality in Karachi.

Groundwater, Karachi, Water Quality, Multivariate Analysis, Geospatial, Health Risk Index

Khan, M. , Ayoub, W. , Saied, S. , Hussain, M. , Masood, S. , Siddique, A. and Khwaja, H. (2019) Statistical and Geospatial Assessment of Groundwater Quality in the Megacity of Karachi. Journal of Water Resource and Protection, 11, 311-332. doi: 10.4236/jwarp.2019.113018.