Abstract
Calculation results for the forms in which chemical elements migrate in the thermal waters of the Bang deposit (Central Vietnam) are reported for the first time. The studied waters are divided into two groups with respect to temperature: 24.3–34.5 оС for the first group and 62.1–97.1 оC for the second group. The first type relates to the waters of HCO3-Cl-Na-Mg composition, has very low mineralization (44–87 mg/dm3) and is characterized by рН from weakly acidic to weakly alkaline (5.71-7.84). The second type relates to the waters of HCO3-Na composition with total mineralization up to 256-659 mg/dm3 and рН from 8.03 to 8.51. Calculations of the forms of migration of chemical elements showed substantial differences in their behavior for two revealed groups. For example, in waters with the temperature of 24.3–34.5 оC, the dominating form is migration of free ions. For thermal waters with the temperature of 62.1–97.1 оC, migration of the elements in compounds with carbonates and sulfur is characteristic, as well as in the form of free ions.
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