Presentations at international and national conferences
Presentations at international scientific conferences abroad
À.1. Velitchkova N., Daskalova N. “Line selection and detection limits in the determination of arsenic, bismuth, mercury, antimony, selenium, tin, tellurium and thallium in environmental materials by ICP-AES”. 8-th Federation of European Chemical Societies FECS Conference on Chemistry and Environment. Athens, Greece 31.09-4.09.2002, Poster Presentation.
À.2. Pentcheva N. E., Velitchkova N., Van’t dack L. “Chemical speciation in solution and suspension of heavy metal pollutants in waters (Plovdiv region, Bulgaria)”, 8-th Federation of European Chemical Societies FECS Conference on Chemistry and Environment. Athens, Greece 31.08-4.09.2002. Oral Presentation.
À.3. Velitchkova, N., Pentcheva E.N., Daskalova N. “HR-ICP-AES study of water and soil pollution due to mining and metallurgical activities”, 4th Mediterranean Basin Conference on Analytical Chemistry MBCAC IV, Portoroz, Slovenia, 15-20.09.2002. Poster Presentation.
À.4. Pentcheva, E.N., Velitchkova N., Van’t dack L. “Soluble and colloidal chemical species of heavy metal and arsenic in polluted waters (Plovdiv-Assenovgrad region, Bulgaria)”, 4th Mediterranean Basin Conference on Analytical Chemistry MBCAC IV, Portoroz, Slovenia, 15-20.09.2002, Poster Presentation.
À.5. Karadjov, M., Velitchkova N., Meersman G. “Preliminary statistical treatment of the analytical data - base to the monitoring strategy by the study of the heavy metal pollution in waters from the Plovdiv region, Bulgaria”, 3rd Aegean Analytical Chemistry Days AACD, Polihnitos, Lesvos, Greece, 29.09.-03.10.2002, Poster Presentation.
À.6. Velitchkova N., Pentcheva E.N., Hristcheva E. “Dissemination and Evolution of the Metals Pollution of Ground and Surface Waters, Soils and Sediments in Plovdiv - Assenovgrad River Terraces (Bulgaria)” Sixth International Symposium & Exhibition on Environmental Contamination in Central and Eastern Europe and the Commonwealth of Independent states” Prague, Czech Republic, 1-4.09.2003, Poster Presentation.
À.7. Pentcheva E.N., Velitchkova N., Van?t dack L. “Dynamics and Speciation of Soluble and Suspended Heavy Metals and Arsenic in Water Contaminated by Metallurgical and Mining Activities, Plovdiv Region (Bulgaria)”, Sixth International Symposium & Exhibition on Environmental Contamination in Central and Eastern Europe and the Commonwealth of Independent states” Prague, Czech Republic, 1-4.09.2003, Oral Presentation.
À.8. Velitchkova N., Pentcheva E. N., Daskalova N. “Determination of arsenic, mercury, selenium, thallium, tin and bismuth in environmental materials by inductively coupled plasma atomic emission spectrometry with the prominent lines in the vacuum ultraviolet”, Colloquium Spectroscopicum Internationale CSI XXXIII, Granada, Spain 7-12.09.2003. Oral Presentation.
À.9. Pentcheva E. N., Velitchkova N. “HR - ICP - AES monitoring investigations of heavy metals and arsenic in polluted waters and related soils, sediments and ore wastes by metallurgical activities”, Colloquium Spectroscopicum Internationale CSI XXXIII, Granada Spain, 7-12.09.2003. Poster Presentation.
À.10. Velitchkova N., Daskalova N., Pentcheva E.N. “Application of inductively coupled plasma atomic emission spectrometry in the determination of trace of elements in environmental materials - methodology of measurements”, 3rd International Conference Instrumental Methods of Analysis: Modern Trends and Applications IMA 2003, Thessaloniki, Greece, 23-27.09.2003. Oral Presentation.
À.11. Karadjov M., Velitchkova N., Pentcheva E.N. “Vegetables and soils analytical investigations in the Pb-Zn metallurgy polluted area - Plovdiv, Bulgaria”, 2nd Black Sea Basin Conference on Analytical Chemistry BSBCAC and Workshop on 1st Marmara Analytical Chemistry Days: “Recent Developments in Analytical Chemistry” Yildiz Technical Univercity, Sile - Istanbul, Turkey, 12-17.09.2003. Poster Presentation.
À.12. Pentcheva E. N., Velitchkova N., Atanassova R., Benderev A., Karadjov M. “Migration ability of heavy metals and As in water - soil system in metallurgical region”, 11th International Symposium on Water-Rock Interaction WRI-11, Saratoga Springs, NY, USA, 27.06-02.07.2004. Poster presentation.
À.13. Pentcheva E. N., Velitchkova N., Atanassova R., Karadjov M. “Water-Soil interaction in metallurgy contaminated area as a source of secondary heavy metal and As pollution”, 11th International Symposium on Solubility Phenomena, Including Related Equilibrium Processes ISSP, Aviero, Portugal 25-29.07.2004, Poster presentation.
À.14. Pentcheva E. N., Atanassova R., Velitchkova N. “Chemical speciation of heavy metals and arsenic in dissolved waste clinker material (Plovdiv-Assenovgrad region, Bulgaria)”, 11th International Symposium on Solubility Phenomena, Including Related Equilibrium Processes ISSP, Aviero, Portugal 25-29.07.2004, Oral presentation.
À.15. Velitchkova N., Velichkov S., Daskalova N. “Inductively coupled plasma emission spectrometry for the determination of traces of rare earth elements in rare earth matrixes - possibilities and limitations”, Colloquium Spectroscopicum Internationale CSI XXXIV Antwerp, Belgium, 4-9.09.2005, Oral Presentation.
À.16. Dimitrova, D., Cholakova Z., Velitchkova N., Kotsev Ts., Mladenova V., Kerestedjian T., Antonov D. “Heavy metal and metalloid concentration dynamics in mine and surface waters in the vicinity of Chiprovtsi and Martinovo mines, Northwestern Bulgaria”. 11th International Conference of the Geological Society of Greece "Geoenvironment: past, present, future", National and Kapodistrian University of Athens. Athens, Greece, 24 - 26 May 2007, Oral Presentation.
À.17. Milanova M., Velitchkova N., Daskalova N. “Application of inductively coupled plasma atomic emission spectrometry in the analysis of environmental materials”, European Conference on Analytical Chemistry EUROanalysis XIV, Antwerp, Belgium, 9-14 September 2007, Poster presentation.
A.18. Maes N., Salah S., Jacques D., Aertsens M., Van Gompel M., De Canniere P., Velitchkova N. “Retention of Cs in Boom Clay: Comparison of data from batch sorption tests and diffusion experiments on clay cores”, 3rd International meeting Clays in Natural & Engineered Barriers for Radioactive Waste Confinement, Lille, France, Sept. 17-20.2007 Poster presentation.
À.19. Petrova P., Velitchkova N., Velitchkov S., Havezov I., Daskalova N. “Determination of Platinum, Palladium and Rhodium in environmental materials by high resolution inductively coupled plasma optical emission spectrometry (HR-ICP-OES)”, Colloquium Analytische Atomspectroskopie CANAS 2013, Freiberg, Germany, 17-19.03.2013, Poster presentation.
Presentations at national and international scientific conferences in Bulgaria
À.21. Velitchkova, N., Pentcheva E. N., Daskalova N. “Investigation on the concentration levels of heavy and toxic elements in environmental materials from Plovdiv region”, 10th International Symposium on Solubility Phenomena, Workshop “Solubility Phenomena - Application for Environmental Improvement”, Varna, Bulgaria, 21-26.07.2002, Poster Presentation.
À.22. Pentcheva, E. N., Velitchkova N., Van’t dack. L. “Soluble chemical species of heavy metal pollutants in waters (Plovdiv Region, Bulgaria)”. 10th International Symposium on Solubility Phenomena and Workshop: Solubility Phenomena - Application for Environmental Improvement”, Varna, Bulgaria. 21-26.07.2002, Oral Presentation.
À.23. Velitchkova, N., Daskalova N. “Determination of heavy and toxic elements in soils from Plovdiv region” 5th European Furance Symposium & 10-th International Solid Sampling Colloquium with Atomic Spectroscopy, Blagoevgrad, Bulgaria, 1-4.09.2002. Poster Presentation.
À.24. Velitchkova N., Pentcheva E. N., Daskalova N. “ICP - AES investigation on heavy metal water and soil pollution in Plovdiv Region (Bulgaria)”, 12th International Symposium Ecology 2003, Sunny Beach, Bulgaria, 2-6.06.2003. Oral Presentation.
À.25. Pentcheva E. N., Velitchkova N., Benderev A. “Migration ability and forms in solution and suspension of water metal pollutants in contaminated Plovdiv - Assenovgrad Region”, 12th International Symposium Ecology 2003, Sunny Beach, Bulgaria, 2-6.06.2003. Oral Presentation.
À.26. Pentcheva E. N., Benderev A., Velitchkova N., Van?t dack L. “Chemical Speciation in Solution and Suspension of Metal Pollutants and As in Waters, Contaminated by Metallurgical and Mining Activities”, 3d International Conference of Modern Management of Mine Producing, Geology and Environmental Protection SGEM 2003, Albena, Bulgaria, 9-13.06.2003, Oral Presentation.
À.27. Pentcheva E.N., Velitchkova N., Karadjov M. “Occurrence and Evolution of Heavy Metals and As Pollution in Waters and vegetables in Plovdiv - Assenovgrad area”, 3d International Conference of Modern Management of Mine Producing, Geology and Environmental Protection SGEM 2003, Albena, Bulgaria, 9-13.06.2003, Oral Presentation.
À.28. Velitchkova N., Karadjov M., Pentcheva E.N., Daskalova N. “Application of ICP - AES for high dissolved salts analysis, tools and methods”, International Conference Scientific and policy challenges towards an effective management of the marine environment, Institute of Oceanology of the Bulgarian Academy of Sciences Albena, Bulgaria, 12-18.10.2003. Poster Presentation.
À.29. Âåëè÷êîâà Í., Äàñêàëîâà Í., Ïåí÷åâà Å.Í. “Àòîìíà åìèñèîííà ñïåêòðîìåòðèÿ ñ èíäóêòèâíî ñâúðçàíà ïëàçìà (ICP-AES) - âúçìîæíîñòè çà îïðåäåëÿíå íà Y, Zr, Nb, Hf, Ta, è Th â ãåîëîæêè ïðîáè” Íàó÷íà ñåñèÿ çà ñòóäåíòè è äîêòîðàíòè, Õèìè÷åñêè Ôàêóëòåò, Ñîôèéñêè Óíèâåðñèòåò Ñîôèÿ, Áúëãàðèÿ, 18-20 Ìàé 2004ã. Óñòåí äîêëàä.
À.30. Pentcheva E. N., Velitchkova N., Atanassova R., Benderev A. “Water-soil interaction in metallurgy contaminated area as a source of secondary heavy metal and As pollution”, 13th International Symposium Ecology 2004, Sunny Beach 7-11.06.2004. Oral Presentation.
À.31. Karadjov M., Velitchkova N., Pentcheva E.N., Petkov I. “Heavy metal and As contamination of waters, soils and vegetables in KCM smelter site - GIS mapping and monitoring”, 3d International Conference of Modern Management of Mine Producing, Geology and Environmental Protection, SGEM 2004, Albena, Bulgaria, 14-18.06.2004, Oral Presentation.
À.32. Petrova P., Velitchkova N., Havezov I., Daskalova N. “Determination of Platinum, Palladium, Rhodium, Barium and Lead in automotive catalytic converters by inductively coupled plasma atomic emission spectrometry (ICP-AES), International Scientific Conference Mathematics and Natural Sciences, South - West University Blagoevgrad, Bulgaria, 8-11.06.2005, Oral Presentation.
À.33. Pentcheva E.N., Karadjov M., Velitchkova N. “Water-soil interaction - a source of secondary heavy metal and As pollution and possible geochemical barrier in Pb - Zn smelter area”, 14th International Symposium Ecology 2005, Sunny Beach, Bulgaria, 7-11.06.2005. Oral Presentation.
À.34. Velitchkova N., Pentcheva E. N., Petkov I., Atanassova R. Daskalova N. “Application of ICP-AES for the modeling of water-solide phase interaction in metal contaminated metallurgical region”, 14th Intern. Symposium Ecology 2005, Sunny Beach, Bulgaria, 7-11.06.2005. Oral Presentation.
À.35. Dimitrova D., Velitchkova N., Kotsev Ts., Antonov D., Cholakova Z. “Heavy metals and metalloids content assessment in mine waters from Martinovo and Chiprovtsi mines, Northwestern Bulgaria”, National Conference with international participation GEOSCIENCES 2006, Sofia, Bulgaria, Nov. 30 - Dec. 1, 2006, Poster Presentation.
À.36. Daskalova N., Velitchkova N. “The role of inductively coupled plasma atomic emission spectrometry in the analysis of environmental materials”, Workshop on Ecomaterials and Processes: Characterization and methodology MetEcoMat, Plovdiv, Bulgaria. 19-21. April 2007, Oral Presentation.
À.37. Boevski I., Milanova M., Velitchkova N., Havezov I., Velichkov S., Daskalova N. “Application of certified reference material for estimation of the accuracy in the analysis of soils and sediments by inductively coupled plasma atomic emission spectrometry (ICP-AES)”, Workshop on Ecomaterials and Processes: Characterization and methodology MetEcoMat, Plovdiv Bulgaria, 19-21. April 2007. Poster presentation.
À.38. Boevski I., Milanova M., Velitchkova N., Havezov I., Velichkov S., Daskalova N. “Inductively coupled plasma atomic emission spectrometry - accuracy of analytical results and detection limits”, 4th Black sea basin conference on analytical chemistry BBCAC, Sunny Beach, Bulgaria, 19-23 Sept. 2007, http://www.chem.uni-sofia.bg/bbcac-4/, Poster presentation.
À.39. Velitchkova N., Velichkov S., Daskalova N. “Possibilities and limitations of different inductively coupled plasma optical emission spectrometry (ICP-OES) systems in the determination of trace elements in matrices with various compositions”, Eighth National Conference on Chemistry, Chemistry for Sustainable Development, University of Chemical Technology and Metallurgy Sofia, Bulgaria, 26-28.06.2014, Oral Presentation.
À.40. Petrova P., Velitchkova N. “Application of ICP-OES in the determination of platinum group of elements in different materials”, Eighth National Conference on Chemistry, Chemistry for Sustainable Development, University of Chemical Technology and Metallurgy Sofia, Bulgaria, 26-28.06.2014, , Oral Presentation.
À.41. Velitchkova N., P. Petrova, S. Velichkov, N. Daskalova, "Possibilities of inductively coupled plasma optical emission spectrometry (ICP-OES) in the determination of rare and trace elements", Scientific meeting " Rare and trace elements in Bulgaria: geological, technological aspects 27.11.2014, Sofia, Bulgaria, Oral Presentation.
À.42. Velitchkova N., I. Atanassova, O. Veleva, E. Pentcheva, "Possibilities of inductively coupled plasma optical emission spectrometry (ICP-OES) in the determination of trace elements in environmental samples" International conference "Soil and Agrotechnology in a Changing World" 11-15.05.2015, Sofia, Bulgaria, Oral Presentation.
À.43. Velitchkova N., P. Petrova, S. Velichkov, N. Daskalova, " Inductively coupled plasma optical emission spectroscopy - determination of rare earth and platinum group of elements" Sixth International Conference FMNS-2015 South-west University Blagoevgrad, 10 - 14.06.2015, Blagoevgrad, Bulgaria, http://www.fmns.swu.bg/en/index.html Oral Presentation.
À.44. M. Karadjov, N. Velitchkova, O. Veleva, S. Velichkov, N. Daskalova, “Spectral interferences in the determination of rhenium in molybdenum and copper concentrates by inductively coupled plasma optical emission spectrometry (ICP-OES)” Ninth National Conference on Chemistry Science and Technology for Better Life, St. Kliment Ohridski University of Sofia, Faculty of Chemistry and Pharmacy, 29.09. - 01.10 2016, Sofia, Bulgaria, http://9ncc.unionchem.org - Oral Presentation.
À.45. O. Veleva, N. Velitchkova, M. Karadjov, „Problems and possibilities of inductively coupled plasma optical emission spectrometry in the determination of toxic elements in environmental materials”, Ninth National Conference on Chemistry Science and Technology for Better Life, St. Kliment Ohridski University of Sofia, Faculty of Chemistry and Pharmacy, 29.09. - 01.10 2016,, Sofia, Bulgaria, http://9ncc.unionchem.org - Poster presentation.
À.46. N. Velitchkova, S. Velichkov, M. Karadjov, N. Daskalova, „Optimization of the Plasma operating conditions in inductively coupled plasma optical emission spectrometry”, 10-th Chemistry Conference (10CC), Faculty of Chemistry at University of Plovdiv „Paisii Hilendarski", 9-11.10.2016, Plovdiv (Bulgaria) - Oral Presentation.
À.47. O. Veleva, N. Velitchkova, S. Velichkov, M. Karadjov, N. Daskalova, „Comparison of radial viewing 40.68 MHz ICP and axial viewing 27.12 MHz ICP in the determination of rhenium in molybdenum and copper concentrates”, 10-th Chemistry Conference (10CC), Faculty of Chemistry at University of Plovdiv „Paisii Hilendarski", 9-11.10.2016, Plovdiv (Bulgaria) - Oral Presentation.