Author(s): A. S. M Sadequr Rahman Bhuyain, Md. Motaher Hossain, Debarshi Bhattacharjee, Mehedi Hasan, Khadizatul Kubra Mim and Uttam Kumar Sarker

Abstract: The Surma River is one of the most important river in Bangladesh, which is located in the north eastern region of Bangladesh. The study was conducted to assess physico-chemical parameters such as water temperature, pH, Dissolved Oxygen (DO), Carbon Dioxide (CO₂) and Total Hardness of this river in two different seasons (wet and dry season). Samples were collected during December 2017 to May 2018 from three different sampling sites. The result revealed that mean values of water temperature: 21.07 ⁰C in wet season and 25.08⁰C in dry season, pH: 7.31 in wet and 7.21 in dry season, DO: 6.88 mgL-1 in wet and 6.85 mgL-1 in dry season, CO₂: 16.11 mgL-1 in wet where 15.53 mgL-1 in dry season and Total Hardness: 105.24 mgL-1 in wet and 107.56 mgL-1 in dry season respectively. Evaluated values were found within the standard limit set by FAO, WHO and DoE etc. But in some sampling sites, it has exceeded the safe limit which may become alarming in future. So, the proper authority should take necessary steps to maintain the acceptable water quality of the Surma River.

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