A. H. M. Shofiul Islam Molla Jamal^1,, Shamim Ahmed¹, Shakila Akter¹, Aynun Nahar¹, Rokaia Sultana¹, Md. Ripaj Uddin¹, Tajnin jahan¹, Shahnaz Sultana¹, Mehedi Hasan¹

In the present study, rainwater samples were collected from the Khulna city of Bangladesh during pre-monsoon season (March-May) and monsoon season (June-October) with standard rainwater collection instruments in the year 2017 to 2019 to evaluate their physical and chemical quality parameters properties. The following water quality parameters were determined: pH, EC, TDS, DO, alkalinity, acidity, hardness, Ca²⁺, Mg²⁺, SO4^2-, NO₃^2-, Cl^- and heavy metals. This study revealed that rain water quality was within the permissible drinking water standards limits prescribed by Environment Conservation Rule (ECR, 1997) of Bangladesh. Metal ions (As, Cd, Cr, Pd and Hg) were found in below the detection limit (BDL) of AAS for these collected rainwater samples. Rainwater quality during monsoon season was better than that of pre-monsoon season in Khulna city due to particle of dusts in the air. Atmospheric suspended particulate matter (SPM) including PM10 might be contributed some parameters; EC TSD, Ca²⁺, Mg²⁺, SO4^2-, NO₃² and pH may be slightly changed due to present gaseous components (CO₂, SO₂ and NO₂). If rainwater is properly harvested that will be a safe, cost effective and alternative to provide an access to safe drinking water in the saline coastal region of Khulna area.

rainwater, salinity, heavy metals, water quality, physicochemical properties