Using Multiple Correspondence Analysis to Identify Types of Pollution in Water Resources of Lukula Region

Water quality degradation is a major environmental and public health issue, particularly in developing countries where communities depend on untreated groundwater and spring water for domestic use. In the Lukula region (Kongo Central Province, Democratic Republic of the Congo), limited access to safe drinking water increases the risk of exposure to physicochemical and microbiological contamination. This study aimed to characterize the quality of spring waters in the Lukula Health Zone and to identify the main types of pollution affecting these resources using multivariate statistical techniques. Water samples were collected from ten springs during two sampling campaigns conducted in April and December ۲۰۱۸. Physicochemical parameters (pH, temperature, electrical conductivity, total dissolved solids, turbidity, alkalinity, hardness, major ions, and nutrients) and microbiological indicators (total viable counts and total coliforms) were analyzed. Data were processed using Principal Component Analysis (PCA), Hierarchical Ascending Clustering (HAC), and Multiple Correspondence Analysis (MCA). The results revealed significant spatial variability in water quality. PCA indicated that the first two principal components explained ۶۴.۱% of the total variance, with the first component primarily associated with mineralization, alkalinity, hardness, bicarbonates, calcium, and magnesium, and the second primarily associated with chloride, sodium, potassium, and sulfate. HAC classified the springs into three hydrochemical groups reflecting differences in mineralization and salinity. MCA identified multiple pollution patterns, including mineral pollution, nutrient enrichment, microbiological contamination, sediment-related pollution, and anthropogenic impacts. Springs such as Kizinga, Kiyangi I, Kinduka, and Kilonde showed the highest contamination levels. These findings demonstrate the value of multivariate statistical methods for water-quality assessment and provide a scientific basis for monitoring, pollution control, and sustainable water-resource management in the Lukula region.

کلیدواژه ها:

Multiple Correspondence Analysis ، Multivariate Statistical Analysis ، Water Quality Assessment ، Spring Water Pollution ، Lukula Region