Geochemical processes influencing stream water chemistry: a case study of Ala River, Akure, Southwestern Nigeria

This study illustrated the changes, pollution status, and significant pollution causes for Brunei River, Brunei Darussalam. Eleven parameters (pH, temperature, oxidation–reduction potential (ORP), dissolved oxygen, biochemical oxygen demand, conductivity, total dissolved solids (TDS), salinity, turbidity, ammonia-nitrogen (NH3-N), and total coliform) were analyzed from eight monitoring sites in 1984, 2019, 2020, and 2021. Box plots were used for a comparative study between 1984 and 2019+ data, while hierarchical cluster analysis (HCA) and principal component analysis (PCA) tests were performed on data from recent years (2019+). The box plot analysis showed that pollution levels in 2019, 2020, and 2021 increased compared to 1984 values, especially for total coliform bacteria. The doubling of the coliform bacteria concentration in the river between 1984 and 2019+ is concerning because the Malaysia National Water Quality Standards (NWQS) guideline values for fishing have now been exceeded. HCA pointed out that upstream stations are more polluted than downstream. PCA of the 11 water quality datasets generated five factors with a total variance of 75.21% and identified seawater intrusion, hydrological processes, and anthropogenic activities as possible causes for Brunei River water quality degradation.

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Comparative Analysis of Water Quality in Major Rivers of Türkiye Using Hydrochemical and Pollution Indices

Yavuz,

Kartal,

Sambito

2024

Water

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This study provides a comprehensive analysis of the water quality in five major rivers in Türkiye: Sakarya, Yeşilırmak, Kızılırmak, Seyhan Rivers, and Niğde Creek. Utilizing hydrochemical diagrams and the River Pollution Index (RPI), we assess the temporal and spatial variations in water quality over the past three decades. The hydrochemical characteristics reveal a dominant calcium-bicarbonate (Ca-HCO3) type water, indicating strong geological control primarily influenced by carbonate weathering. Seasonal variations and anthropogenic influences, particularly agricultural runoff and industrial discharge, contribute to significant changes in ion concentrations, especially in the Kızılırmak and Yeşilırmak Rivers. The RPI results classify these rivers as ‘Severely polluted’ to ‘Moderately polluted’, driven by high levels of suspended solids and biochemical oxygen demand. This study underscores the urgent need for tailored pollution control measures and sustainable water management practices in order to mitigate the impacts of anthropogenic activities and protect the ecological health of these vital water resources. The findings provide a robust framework for future research and policymaking to enhance water quality monitoring and management strategies in the region.

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Geochemical processes influencing stream water chemistry: a case study of Ala River, Akure, Southwestern Nigeria

Cited by 3 publications

References 30 publications

Effect of Seasonal Variation on Pollution Load of Water of Hokersar Wetland: a Case Study of Queen Wetland of Kashmir, J&K, India

Effect of Seasonal Variation on Pollution Load of Water of Hokersar Wetland: a Case Study of Queen Wetland of Kashmir, J&K, India

Importance of baseline assessments: monitoring of Brunei River's water quality

Comparative Analysis of Water Quality in Major Rivers of Türkiye Using Hydrochemical and Pollution Indices

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