Assessing seasonal fluctuations in physicochemical properties and heavy metals in the Pasur River, Bangladesh

This study aimed to investigate the current pollution status of the Pasur River situated alongside Mongla Port in Bangladesh. The EC, TOC, pH, turbidity, and TDS in water samples were examined by standard protocol. Fe, As, Cr, Pb, Cd, Zn, Ni, and Cu were measured by the atomic absorption spectroscopy method. The concentrations of heavy metals (Fe, Pb, Zn, and As) exceeded the standard value (0.3, 0.01, 3, and 0.01 mg/L, respectively) during the winter and summer indicating water from the study river is unsafe for human use and identified the contaminants of concern. A considerable positive correlation (p < 0.05) was observed between EC and TDS during the summer and winter seasons. Seasonal comparisons indicated significantly lower physicochemical parameters during the rainy season due to rainfall dilution effects. By highlighting seasonal variability and identifying key contaminants, this study provides crucial data for informed water quality management strategies, emphasising the need for treating Pasur River water before residential use. The Pasur River is vital to Bangladesh’s economy because of the Mongla port, which requires measures such as regular dredging to prevent siltation, monitoring pollution levels, and implementing sustainable practices to ensure its proper utilisation.