Magnetic nanogels based on 2-hydroxyethyl methacrylate (HEMA) and N,N’-methylene-bis-(acrylamide)(MBA) were prepared via photochemical method under UV irradiation. The structure and compositions of magnetic nanogels are characterized by FTIR, TGA and TEM. TGA measurement indicates that magnetic nanogels contain about 85-92% magnetite. The prepared magnetic nanogels were used to remove cupper ions from industrial water. The proposed mechanism was dependant on the interaction between the surface hydroxyl groups of polymer-Fe3O4 composite and the cupper ions present in the solution. Several factors affecting the absorption capability were studied. These include: structure of nanogels, % of MBA to HEMA, effect of pH and effect of temperature. The obtained data revealed that the maximum absorption capacity was attained at pH 6 and at 40°C. The efficiency decreased remarkably at acidic pH and at a temperature higher than 40°C. It was also found that the ratio of 10% HEMA : 20 mg MBA achieved maximum copper absorption. Furthermore, the reusability of the prepared nanogels was demonstrated.

The geochemical status of groundwater quality in Bhangamor Union under Kurigram District was determined on the basis of local geology, hydrogeology and groundwater chemistry. The study reveals that the values of environment sensitive index parameters like pH, EC, temperature and concentration values of different chemical constituents in groundwater of the study area vary from place to place. The chemical analysis of groundwater in the study area includes cations (Ca2+, Mg2+, Na+, K+, Fetotal), anions (HCO3-, CO3-, Cl-, SO42-, I- , F-) and trace elements (Mn, Pb, Cr, Cd). The concentrations of Ca2+, Mg2+, Na+, K+, HCO3-, Cl- and SO42- in groundwater of the study area do not exceed WHO and DOE drinking water standard values. But the concentrations of I- and F- in groundwater of the study area are very low which are not suitable for drinking purposes. Correlating with WHO and DOE guideline values for drinking water and public heath, it may be concluded that the groundwater of the study area except I- and F- is suitable for all drinking and domestic purposes. Total Hardness (TH) of groundwater is moderately hard which indicates that it is also good in quality for irrigation purposes but not suitable for some industrial purposes especially for food making industries. From the graphical analysis of water samples, it is observed that alkaline earths (Ca2+ and Mg2+) exceed alkalis (Na+ and K+) and weak acid (HCO3-) exceed strong acids (Cl-, SO42-). This confirms that alkaline earths and weak acids dominate the chemical properties of groundwater of the study area. Based on EC, PI, SAR and Na%, it can be said that the groundwater of the study area is suitable for drinking and irrigation purposes. The groundwater is also very much a satisfactory quality for livestock.