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CHANGES IN CONCENTRATION OF SULPHUR(II) COMPOUNDS - COMPARISON OF THE RESULTS FROM MODELING OF CURATIVE WATER MIXING AND RESULTS FROM CHEMICAL ANALYSIS
Abstract
According to Polish law, the natural concentration of sulphur (II) compounds in groundwater higher than 1 mg/L can be a base to find them as a curative water. Sulphur (II) occurs in groundwater usually as hydrogen sulphur or bisulphide ion. Their concentrations and ratios can vary dependent on prevailing conditions. Very often water stays a long way from intake to the spas. What is more in health resorts curative waters could be mixed. These processes can influence on total concentration and forms of occurrence of specific components, like sulphur (II). In the area of Busko-Zdroj chloride-sodium, sulphurous and iodide (Cl-Na, H2S, I) waters occur and are connected with shallow circulation system. They are mostly associated with Cretaceous (marl and limestone of Santonian and sandstones of Cenomanian) formations. They usually occur under Miocene gypsum and clays. In this paper the concentration of sulphur (II) speciation in water from five intakes was determined and compared with the speciations distribution in water from bottling plant established by mixing natural curative water in known proportion. The research was fulfilled on the basis of the results of field and laboratory analysis. Modeling was performed in Phreeqc program version 3.1. The ionic strength of analysed water varied from 0.23 to 0.25 and the wateq4f.dat database was used as a thermodynamic data base. The S(VI)/S(II) redox pair was used to determined redox potential of water. The speciation analysis shows that in curative waters from Busko-Zdroj region almost 25 different sulphur (II) speciations are presented and their concentration are not considerably vary. However the increase in sulphur (II) concentration can be seen after water mixing. What is more, for mixed water the difference between concentration of H2S and HS- is higher than determined in water from intakes and the results of geochemical modeling.
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