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Salt Systems And Natural Resources

Scientific topics

The activities of the Laboratory “SALT SYSTEMS AND NATURAL RESOURCES" (SSNR) at IGIC – BAS are focused on fundamental and applied research in the fields of inorganic material science and preservation and utilization of natural resources.

  • Inorganic material science

The research in this field is targeted in two directions:

– chemistry of water-salt systems;

– synthesis and characterization of calcium phosphate biomaterials.

Chemistry of water-salt systems. Theoretical and experimental studies are carried out on the processes of dissolution and crystallization in water-salt two-, three- and multicomponent systems. Crystallization and co-crystallization processes of simple and double salts, as well as of mixed crystals are being investigated. The kinetics of the processes is studied. Stable and metastable phase equilibria are thermodynamically modeled. The regularities between the composition and structure of the solutions and the structure and type of crystallizing solids are established. Interactions taking place in systems under changing conditions are predicted and clarified.

Synthesis and characterization of calcium phosphate biomaterials. Studies on the synthesis and characterization of biomedical materials, including nano- and modified calcium-phosphate composites, are being carried out. Modern instrumental and computational methods are applied to the investigation of the relationship composition-structure-property. Technologies for the production of biomaterials (mainly for dental medicine) with modified chemical and improved physical characteristics and biological activity are being developed.

  • Preservation and utilization of natural resources

The research is focused on two directions:

– environmental studies;

– sustainable use.

Environmental studies aim at evaluating, predicting and improving the ecological status of industrially polluted natural waters, soils and vegetation by applying various analytical methods and thermodynamic models. Field and laboratory studies are being conducted to determine the degree of contamination, mobility and phytoaccumulation of transition metals. Various thermodynamic models (ionic association model, ionic interaction model and Stockholm- Humic model) are being applied to determine the inorganic and organic chemical species and dynamics of transition metals in the water – soil – soil extract – vegetation ecosystem.

Sustainable use. Natural mineral raw materials are being used to develop alternative biologically active materials containing biogenic trace elements and their compounds that affect the nervous, antioxidant and immune systems or regulate the mineral dysbalance in the body. Priority use is made of the mineral resources of the Black Sea. Product technologies for medical cosmetics and pharmaceutical industry are being developed. Small-scale production is organized.

Selected articles

1) Rabadjieva, A. Kovacheva, S. Tepavitcharova, M. Dassenakis, S. Karavoltsos
 Trace metal pollution of waters and soils in Kardjali region, Bulgaria,
Еnviron Мonit Аssess , 190(7) (2018) 383-399,

2) Tepavitcharova, S., Havlíček, D., Matulková, I., Rabadjieva, D., Balarew, C., Gergulova, R., Němec, I., Císařová, I., Plocek, J.
Solid phases in the systems glycine–ZnX2–H2O (X = Cl−, Br−, I−) at 25 °C,
Monatshefte fur Chemie, 149 (2) (2018) 299-311.

3) Balarew, C., Tepavitcharova, S., Kamburov, S.,
Study of the spontaneous crystallization of Na2SO47H2O and Na2SeO4•7.5H2O.
Monatshefte für Chemie, 149 (2018) 289-298.

4) Sezanova, K., Kovacheva, D., Rabadjieva, D., Gergulova, R..
Mg- and Zn-modified calcium phosphate fine powders examined by Rietveld refinement. Bulgarian Chemical Communications, 50, Special Issue: F (2018) 99-106.

5) Kamburov, S., Schmidt, H., Voigt, W., Balarew, C.,
Crystal structures of sodium magnesium selenite decahydrate, Na2Mg(SeO4)210H2O, a new selenate salt, and sodium magnesium selenate dihydrate, Na2Mg(SeO4)2•2H2O.
Acta Cryst. C, 73 (2017) 582-587.

6) Rabadjieva, D., Tepavitcharova, S., Sezanova, K., Gergulova, R.,
Chemical Equilibria Modeling of Calcium Phosphate Precipitation and Transformation in Simulated Physiological Solutions,
J Solution Chem 45 (2016) 1620–1633

7) Tepavitcharova, D. Havlícek, I. Matulkova, D. Rabadjieva, R. Gergulova, J. Plocek, I. Nemec, I. Císarova,
New zinc-glycine-iodide complexes as a product of equilibrium and non-equilibrium crystallization in the Gly – ZnI2 – H2O system,
Journal of Molecular Structure 1120 (2016) 42-49.

8) Balarew, Ch., Tepavitcharova, S., Rabadjieva, D., Kamburov, S.,
On the crystallization kinetics of highly soluble salts,
Pure and Applied Chemistry, 87(5) (2015) 445-451.

9) Kovacheva, D. Rabadjieva, St. Tepavitcharova,
Simulation of stable and metastable sea-type carbonate systems for optimization of MgCO3.3H2O precipitation from waste sea brines,
Desalination, 348 (2014) 66–73

10) Tepavitcharova, S., Rabadjieva, D., Todorov, , Kovacheva, A., Dassenakis, M., Paraskevopoulou, V.
Chemical speciation in fresh, saline and hyper-saline waters,
Pure and Applied Chemistry, 86 (7) (2014) 1097-1104.

Scientific Collaboration

  • Department of Inorganic Chemistry, Faculty of Science, Charles University, Czech Republic
  • Institute of Inorganic Chemistry of the ASCR, Czech Republic
  • Department of Chemistry, Laboratory of Environmental Chemistry, National and Kapodistrian University of Athens, Greece

Staff:

Diana Rabadjieva

Assoc. Professor, PhD, Head of Laboratory

Call: +359 2 979 39 25

Email: didiarab@svr.igic.bas.bg

    Stefka Tepavitcharova

    Assoc. Professor, PhD

    Call: +359 2 979 39 08 +359 2 979 39 26

    Email: stepav@svr.igic.bas.bg

      Antonina Kovacheva

      Assist. Prof.

      Call: +359 2 979 2535

      Email: antonina1975@abv.bg

        Kostadinka Sezanova

        Chemist

        Call: +359 2 979 39 26 +359 2 979 25 35

        Email: ksezanova@abv.bg

          Stoyan Kamburov

          Chemist

          Call: +359 2 979 39 25

          Email: stucik@gmail.com

            Radost Ilieva

            chemical Engineer

            Call: + 359 2 979 2535

            Email: radipl@mail.bg

              Rumijana Gergulova

              Chemist

              Call: +359 2 979 25 35

              Email: rumigg@yahoo.com

                Staff - Burgas:

                Tsvetelyuba Petrova

                Chemical analyst Chem. Eng.

                  Nadezhda Georgieva

                  Technologist Chem. Eng.

                    Jeannette Zhelezova

                    Production manager Eng.

                      Peter Georgiev

                      Machine operator

                        Dimitar Duganov

                        Machine operator

                          Georgi Kostadinov

                          Machine operator

                            Nina Valkova

                            Machine operator

                              Dorina Todorova

                              Machine operator

                                Katya Kaneva

                                Machine operator

                                  Stoyanka Popova

                                  Machine operator

                                    Scientific projects

                                    Chemical species of trace metals, their behavior in polluted natural waters and soils and impact on the ecosystem plants – small mammals – endoparasites. Experimental study and thermodynamic modeling (GEOBIOCHEM)

                                    Program National Scientific Fund
                                    Coordinator Assoc. Prof. D. Rabadjieva
                                    Partner organizations IEMPAM-BAS
                                    Period 2017 - 2020

                                    Chemistry of water-salt systems for the recovery of natural mineral resources and waste products, in particular marine chemical resources

                                    Program: Self-financing
                                    Coordinator: Assoc. Prof. S. Tepavitcharova
                                    Period : 2001 – 2020

                                    National research program "Environmental protection and reduction of adverse events and natural disasters’ risks"

                                    Program Ministry of Education and Science
                                    Lieder of the team from IGIC-BAS Assoc. Prof. Dr. D. Rabadjieva

                                    Period 2018 – 2023

                                    Study on the relationship synthesis - structure - interphase transitions - mechanical properties- biological properties of calcium phosphate composite biomaterials with applications in bone surgery and dental medicine- DFNI Т 02-5/12.12.2014

                                    Program National Scientific Fund
                                    Coordinator Assoc. Prof. D. Rabadjieva
                                    Partner organizations IEMPAM-BAS
                                    Faculty of Chemistry and Pharmacy, Sofia University
                                    Faculty of Dental Medicine, Medical University-Sofia
                                    Period 2014 – 2017

                                    Biomaterials for bone implants - calcium-phosphate based ceramics, cements and hybrid materials DTK 02-70/17.12.2009

                                    Program National Scientific Fund
                                    Coordinator Assoc. Prof. Dr. Sл Tepavitcharova
                                    Partner organizations
                                    Faculty of Chemistry and Pharmacy, Sofia University
                                    IEMPAM-BAS
                                    Faculty of Dental Medicine, Medical University-Sofia
                                    Period 2009 - 2014