The copolymers of acrylamide-maleic anhydride and acrylamide-diallyl dimethyl ammonium chloride of different ionicities were used for the removal of color, solids, etc., from effluent generated from textile industry. The studies have been carried out to remove color generated in the effluent. To estimate dye content, we prepared standard curve using UV-vis spectrophotometer at different dye concentration following the Beer Lambert's Law. The copolymers of acrylamide-maleic anhydride and acrylamide-diallyl dimethyl ammonium chloride of known concentration were dosed in the known concentration of the dye. These polymers made flocks by adsorption with dyes and these colored flocks were filtered out. The intensity of the color of water went down on increasing the concentration of the polymers. The color of the textile effluent was removed to the extent of 97% using above mentioned polymers.

Depression in the transition temperature of Glauber's salt owing to the presence of U 0 2 ? + and other polycations of uranium formed by the hydrolysis of U022+ have been measured a t different pH. The average degree of condensation calculated from these measurements appear to confirm the existence of the polycations with the general formula UO2[(OH),UO2],,2+ with ii increasing rapidly above pH 5.

From the depression of the transition temperatures of Glauber's salt in presence of sodium chromate a t various pH's the average degree of condensation under different acidic conditions has been calculated. The results have also been used to calculate the equilibrium constants of the reactions HCr0,-= H+ + CrO,,-2HCr0,-= Cr,07,-+ H, O for comparison with the values in the literature.THE equilibrium between chromates and dichromates in aqueous solution has been much ~tudied.~-ll The equilibrium constants for processes (1) and (2) were such as tri-and tetra-chromates 9-12 may exist in highly