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Abstract: The paper presents studies conducted to determine physicochemical parameters such as Cr, Ni, Mo, Cu, Zn, Ca2+, M2+, Br2, P, CaCO3, pH, Ec, TDS in mineral water (borcut) from Vişeu de Sus, Valea Peştilor. The experimental determinations were carried out using the Nikel Low Range Photometer, the Photometer for Boilers and Cooling Towers HI83305, as well as specific photometers for the proposed determinationswithin the study. The obtained results are: 4 µg/L Cr6+; 10 µg/L CrO42- and 9 µg/L Cr2O72-; 0.327 mg/L Ni, 0.1 mg/L Mo6+, 0.308 mg/L Cu, 1.06 mg/L Zn, 170 mg/L Ca2+, 52 mg/L Mg2+, 0.13 mg/L Br2, 0.2 mg/L P, 364 mg/L CaCO3, pH = 7.05 at 21.9°C, EC = 1.99 and TDS = 1 ppt. Groundwaters are more mineralized than surface waters, and the deeper the water layer, the higher the degree of mineralization; the solubility of heavy metals depends on soil acidity, and for ions with the same valence, the retention energy increases with atomic mass.
Keywords: chromium, nickel, copper, zinc, mineral water, borcut, chemical analysis, chemical parameters
1. Introduction
Among the characteristics of groundwater, we should mention the relatively constant temperature and chemical composition, low or absent turbidity, almost complete lack of oxygen, and high bacteriological purity.
The geological nature of the terrain primarily influences the chemical composition of retained water. Due to the continuous contact between water and the soil in which it is stored or through which it circulates, there is an equilibrium established between the composition of the terrain and that of the water.
The porosity and the structure of the terrain determine the type of water layer and underground circulation. The water table can be free or captive. The free water table (phreatic water) is directly fed by the infiltration of precipitation (meteoric waters), and its level fluctuates depending on the amount of retained water. Captive water is separated from the soil surface by an impermeable layer and is deeper; it is also called groundwater.
The storage and circulation of groundwater depend on the geological nature of the terrain. In the case of porous terrains (sands,...