International Science Community Association International Research Journal of Biological Sciences 15 1 2026 02 10 Chemical Dissolution and Pollutant Inflow in River Systems: A Comprehensive Review of Water Contamination Processes 23 29 EN Soumaya Boudjemaa 1 University Hospital Centre, Batna, Algeria and Medical faculty, University of Batna, Algeria Said Nadji 2 University Hospital Centre, Constantine, Algeria Chahrazed Rajai 3 University Hospital Centre, Batna, Algeria Hannen Benaldjia 4 University Hospital Centre, Batna, Algeria and Medical faculty, University of Batna, Algeria Berkahoum Alamir 5 National Toxicology Centre, Algeirs, Algeria . Bharati 1 Research Scholar, SSJDWSSS GPGC, Ranikhet, Almora, India Singh Rajkumar 2 Professor, Lal Bhadur Shastri GPGC, Halduchaur, Nainital, India Kumar Shankar 3 Research Scholar, SSJDWSSS GPGC, Ranikhet, Almora, India Goswami Pooja 1 Department of Zoology, Government College Kota, Kota, Rajasthan, India Mayangar Meenakshi 2 Department of Zoology, Government College Kota, Kota, Rajasthan, India Ahirwar J.R. 1 Prime Minister College of Excellence, ASCA, Govt. P.G. College Niwari, MP, India Verma Anup Kumar 1 Department of Zoology, Acharya Narendra Dev Kisan P.G. College, Babhnan, Gonda, UP, India Singh Abhinav 2 Department of Zoology, Acharya Narendra Dev Kisan P.G. College, Babhnan, Gonda, UP, India > Review Paper 2025 12 9 2026 02 10 This review is a complete study on the chemical dissolution and inflow process of pollutants in river systems and special attention was given in the understanding of why water is polluted. Rivers, being the main elements of hydrological cycle, are extremely prone to pollution of both natural and anthropogenic sources. Chemical dissolution happens when minerals, metals and organic compounds dissolve into water bodies and change the chemistry of the river and may cause damage of aquatic ecosystems. Due to industrial outflow, agricultural effluents, and urban effluents, the inflow of pollutants is the main cause of degradation of water quality. These are chemicals such as heavy metals, pesticides and organic toxins which are very dangerous to the environment and human health. The review explains the different aspects that impact the behavior of pollutants in rivers including the flow processes, the interaction of the sediments and seasonal changes and the significance of the riverine processes in changing and transporting contaminants. It also emphasizes the existing monitoring techniques, pollution prevention approaches and the effects of climate change on the processes of contamination. The relationship between chemical dissolution and pollutants inflow is important to understand to come up with useful management practice and policies to enhance the quality of water and safeguard aquatic life. The review can be a basis of conducting additional studies on how the problem of water contamination in river systems can be mitigated. Copyright@ International Science Community Association