Characterization of mineral water from Vitinički Kiseljak and kozluk springs

The aim of this study was to determine the quality of the mineral water from Vitinički Kiseljak (Nos. 1 to 9, except No. 3) and Kozluk springs that are located near the town of Zvornik in the northwestern Republic of Srpska, BIH. The results were compared with those presented in previous reaserches in order to determine if the water quality has changed and if the water is still suitable for therapeutic purposes. The physicochemical (temperature, odor, pH value, total hardness, electro-conductivity, evaporated residue, suspended materials, chemical consumption of oxygen and KMnO4) and chemical (Fe2+, Mg2+, Mn2+,Zn2+, K+, Ca2+, Cu2+, Al3+, HCO3-, Cl-, CO32-, SiO2, SO42- and S2-) characteristics were analyzed. The obtained results showed that the waters could be classified as hydrocarbonate-sodium-chloride with the mineralization of 2450-5830 mg/dm3. It can also be concluded that the waters are rich in calcium, magnesium and iron, as well as that those are acidic waters due to the presence of free carbon dioxide. In the samples from Kozluk and Kiseljak No. 2 springs oxygen-sulphide is present as well. The ideal ratio of the minerals in these waters is suitable for therapeutical purposes

Effect of degree of crystallinity and the contents of aluminium oxide and sodium oxide on water sorption capacity in NaY zeolite

The paper presents mathematical models which describe the dependence between water sorption capacity, on one hand, and the degree of crystallinity and the content of Na2O and Al2O3 in NaY zeolite, on the other. NaY was synthesized from sodium aluminate solution, water glass and sulfuric acid under different conditions of crystallization. The obtained zeolite powders underwent chemical analysis (Na2O, Al2O3), water sorption capacity (WSC), as well as diffraction analysis which served to determine the degree of crystallinity (CD). Zeolite powder samples had the following values: for the content of Na2O from 13.81 to 16.14%, for Al2O3 from 21.58 to 27.17%, degree of crystallinity from 58.70 to 114.00 and WSC from 21.32 to 36.59%, and regression analysis lead to the conclusion that there is a significant correlation between water sorption capacity and the degree of crystallinity, unlike the contents of Na2O and Al2O3 in the zeolite powder, whose correlation with water sorption capacity was neglibile. The mathematical model obtained by linear regression analysis had a high R2= 0.796, where as non-linear regressional analysis produced a better mathematical model R2= 0.912, where water sorption capacity was expressed through a quadratic model