Scientific Publications:
2002
  • 1. Velitchkova N., N. Daskalova, Line selection and detection limits in the determination of arsenic, bismuth, mercury, antimony, selenium, tin, tellurium and thallium in environmental materials by ICP-AES, Proc. of 8th Federation of European Chemical Societies FECS Conference on Chemistry and the Environment: Chemistry for a Sustaining World, Conference Proceedings: Environmental Science and Pollution Research International Volume 9, Special Issue 3 (2002), p. 305-306, Ecomed publishers, Germany, ISSN: 0944-1344 (Print) 1614-7499 (Online);
  • 2. Pentcheva N. E., N. Velitchkova, L.Vant dack, Chemical speciation in solution and suspension of heavy metal pollutants in waters (Plovdiv region, Bulgaria). Proc. of 8th Federation of European Chemical Societies FECS Conference on Chemistry and the Environment: Chemistry for a Sustaining World, Conference Proceedings: Environmental Science and Pollution Research International, Volume 9, Special Issue 3 (2002), p. 213-214, Ecomed publishers, Germany, ISSN: 0944-1344 (Print) 1614-7499 (Online);
  • 3. Pentcheva E. N., A. Benderev, V. Spassov, I. Petkov, N. Velitchkova, V. Hristov, Dynamics and evolution of heavy metal water pollution in the Plovdiv region (Bulgaria), GEOLOGICA BALCANICA, 32.2-4, Sofia, (2002) p. 97-101. Print: ISSN 0324-0894;
  • 4. Karadjov M., N. Velitchkova, G. Meersman, 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, Conference Proceedings: Proc. of the 3-rd Aegean Analytical Chemical Days 2002, p. 165-167, Lesvos, Greece, Edited by C.E. Efstathiou, A. C. Calokerinos, C. A. Georgiu;

    2003

  • 5. Velitchkova N., Pentcheva E. N., Daskalova N., ICP - AES investigation on heavy metal water and soil pollution in Plovdiv Region (Bulgaria), 12th Intern. Symposium Ecology 2003, Burgas, Bulgaria 2003, Conference Proceedings: Scientific Articles Vol. II Ecology book 2 (2003) p. 147-159, CD-Proceedings, Ass. Prof. Georgi Jordanov & Ass. Prof. Angel Zvezdov (Eds), Publishing by Science Invest LTD-branch Burgas, Bulgaria, A company of Union of Scientists in Bulgaria; ISBN 954 9368 07 6;
  • 6. Velitchkova, N., N. N. Daskalova, E. N. Pentcheva, Application of inductively coupled plasma atomic emission spectrometry in the determination of trace of elements in environmental materials-methodology of measurements, Conference Proceedings: Proc. of 3-d International Conference Instrumental Methods of Analysis, Modern Trends and Applications IMA p. 19-22, 2003, Thessaloniki, Greece, Edited by J. Stratis, Publishing ZITI, Greece, (2003) p.19-22. ISBN 960-431-875-6
  • 7. Pentcheva E. N., Velitchkova N., Benderev A., Migration ability and forms in solution and suspension of water metal pollutants in contaminated Plovdiv-Assenovgrad Region, Proc. of 12th Intern. Symposium Ecology 2003, Burgas, Bulgaria 2003, Conference Proceedings: Scientific Articles Vol. II Ecology book 2 (2003) p. 203-211, CD-Proceedings, Ass. Prof. Georgi Jordanov & Ass. Prof. Angel Zvezdov (Eds), Publishing by Science Invest LTD-branch Burgas, Bulgaria, A company of Union of Scientists in Bulgaria; ISBN 954 9368 07 6;
  • 8. 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, Conference Proceedings: Proc. 3-rd International Conference Modern Management of Mine Producing, Geology and Environmental Protection - SGEM 2003 p. 277-285, ISBN: 954-918181-2, www.sgem.org ;
  • 9. Pentcheva E.N., Velitchkova N., Karadjov M., Occurrence and Evolution of Heavy Metals and As Pollution in Waters and Vegetables in Plovdiv - Assenovgrad area, Conference Proceedings: Proc. 3-rd International Conference Modern Management of Mine Producing, Geology and Environmental Protection - SGEM 2003, p. 295 - 304, 2003 Albena, Bulgaria, ISBN: 954-91818, www.sgem.org ,

    2004

  • 10. Velitchkova, N., E. N. Pentcheva, N. Daskalova, Determination of arsenic, mercury, selenium, thallium, tin and bismuth in environmental materials by inductively coupled plasma atomic emission spectrometry, Spectrochim. Acta Part B 59 (2004) 871-882. doi:10.1016/j.sab.2007.03.033; ISSN: 0584-8547, ELSEVIER, http://www.sciencedirect.com/science/article/pii/S0584854704000758
    5-Year Impact Factor: 3.141,
    In Science Direct Top 25 Hottest Articles - Spectrochimica Acta Part B: Atomic Spectroscopy :
  • Certificate 1. January to March 2005: a No 22
  • Certificate 2. July to September 2004: a No 8
  • Certificate 3. October to December 2004: a No 12

  • 11. Pentcheva E. N., N. Velitchkova, R. Atanassova, A. Benderev, M. Karadjov, Migration ability of heavy metals and As in water-soil system in metallurgical region, Conference Proceedings: Proc. of the 11th International Symposium on Water-Rock Interaction WIR 11 (2004) Vol 2 p.1609-1612, Saratoga Springs New York, USA, Edited by R.B. Wanty, R.R. Seal, A.A. BALCHEMA PUBLISHERS (2004), ISBN 905809 644 0;
  • 12. Pentcheva E. N., N. Velitchkova, R. Atanassova, A. Benderev, Water-soil interaction in metallurgy contaminated area as a source of secondary heavy metal and As pollution, Conference Proceedings: Proc. of 13th Intern. Symposium Ecology 2004, Burgas, Bulgaria, (2004), Scientific Articles Part 1 (2004), p. 450-458, CD-Proceedings, Prof. Nikolai Ribalski and Ass. Prof. Valentin Nenov (Eds), Publishing by Science Invest LTD-branch Burgas, Bulgaria, A company of Union of Scientists in Bulgaria; ISBN 954 9368 07 6;
  • 13. Karadjov M., N. Velitchkova, E. N Pentcheva, I. Petkov, Heavy metal and As contamination of waters, soils and vegetables in KCM smelter site - GIS mapping and monitoring, Conference Proceedings: Proc. 4th International Conference Modern Management of Mine Producing, Geology and Environmental Protection - SGEM 2004 p. 299- 310, 2004, www.sgem.org , SGEM 2004, ISBN: 954-918181-2,

    2005

  • 14. Velitchkova N., N. Daskalova, E. N. Pentcheva, Determination of Y, Zr, Nb, Hf, Ta and Th in geological materials by inductively coupled plasma emission spectrometry, ANNUAIRE de LUNIVERSITE DE SOFIA ST. KLIMENT OHRIDSKI FACULTE DE CHIMIE Tome 97 Livre 2, (2005), p. 173-193; ISSN 0584-0317;
  • 15. Petrova P., Velitchkova N., Havezov I., N. Daskalova, Determination of Platinum, Palladium, Rhodium, Barium and Lead in automotive catalytic converters by inductively coupled plasma atomic emission spectrometry (ICP-AES), Conference Proceedings: Proc. of International Scientific Conference Faculty of Mathematics and Natural Sciences, (2005), Blagoevgrad, Bulgaria, Vol. 2, p. 121-125. ISBN 954-680-352-9;
  • 16. Velitchkova N. S., E. N. Pentcheva, I. S. Petkov, R. Atanasova, N. Daskalova, Application of ICP-AES for the modelling of water-solid phase interaction in metal contaminated metallurgical region, Conference Proceedings: Proceedings of 14th Intern. Symposium Ecology 2005, Burgas, Bulgaria, (2005), Scientific Articles Vol. III, part 3 (2005), p. 33 - 49, CD-Proceedings, Prof. Nikolai Ribalski and Ass. Prof. Valentin Nenov (Eds), Publishing by Science Invest LTD-branch Burgas, Bulgaria, A company of Union of Scientists in Bulgaria; ISBN 954 9368 07 6;
  • 17. Pentcheva E. N., M. Karadjov, N. Velitchkova, Water-soil interaction - a source of secondary heavy metal and As pollution and possible geochemical barrier in Pb - Zn smelter area, Conference Proceedings: Proc. of 14th Intern. Symposium Ecology 2005, Burgas, Bulgaria, (2005), Scientific Articles Vol. III, part 2 (2005), p. 169-180, CD-Proceedings, Prof. Nikolai Ribalski and Ass. Prof. Valentin Nenov (Eds), Publishing by Science Invest LTD-branch Burgas, Bulgaria, A company of Union of Scientists in Bulgaria; ISBN 954 9368 07 6;

    2006

  • 18. Dimitrova D., N. Velitchkova, T. Kotsev, D. Antonov, Z. Cholakova, Heavy metals and metalloids content assessment in mine waters from Martinovo and Chiprovtsi mines, Northwestern Bulgaria, Conference Proceedings: Proc. of National Scientific Conference "Geo-sciences 2006", Sofia, Bulgaria, 2006, GEOSCIENCES 2006, p.276-279, ISBN-10: 954-91606-4-5, ISBN-13: 978-954-91606-4-2;

    2007

  • 19. Dimitrova D., Z. Cholakova, N. Velitchkova, Ts. Kotsev, V. Mladenova, T. Kerestedjian, D. Antonov, Heavy metal and metalloid concentration dynamics in mine and surface waters in the vicinity of the Chiprovtsi and Martinovo mines, Northwestern Bulgaria. Conference Proceedings: Proc. of 11-th International Conference of the Geological Society of Greece, 2007, Athens, Greece, Bulletin of the Geological Society of Greece, vol. XXXVII (2007), p.1397-1408. ISSN 0438-9557;
  • 20. Velitchkova, N., S. Velichkov, N. Daskalova, Inductively Coupled Plasma Atomic Emission Spectrometry - Optimization of the operating conditions in the determination of trace of elements in line - rich emission matrices, Spectrochim. Acta Part B 62 (2007) 386-402 ISSN: 0584-8547, doi:10.1016/j.sab.2007.03.033; http://www.sciencedirect.com/science/article/pii/S0584854707000985
    5-Year Impact Factor: 3.141;

    2008

  • 21. Boevski I., M. Milanova, Velitchkova N., I. Havezov, S. Velichkov, N. Daskalova, Inductively coupled plasma atomic emission spectrometry - Accuracy of analytical results and detection limits in the determination of trace elements in soils and sediments, Eurasian Journal of Analytical Chemistry, Volume 3, Number 1, (2008), p. 19-33, Moment Publication 2008, ISSN 1306-3057; DOI: 10.12973/ejac.2008.00023a , ,
  • 22. Maes N., S. Salah, D. Jacques, M. Aertsens, M. Van Gompel, P. De Canniere, N. Velitchkova, Retention of Cs in Boom Clay: Comparison of data from batch sorption tests and diffusion experiments on intact clay cores, Physics and Chemistry of the Earth, Parts A/B/C , Clays in Natural & Engineered Barriers for Radioactive Waste Confinement Vol. 33, Supplement 1 (2008), S149-S155; doi:10.1016/j.pce.2008.10.002; ISSN: 1474-7065; ELSEVIER;
    Impact Factor (2012): 1.037, 5-Year Impact Factor: 1.330;

    2010

  • 23. Petrova P., S. Velichkov, N. Velitchkova, I. Havezov, N. Daskalova, Problems, possibilities and limitations of inductively coupled plasma atomic emission spectrometry in the determination of platinum, palladium and rhodium in samples with different matrix composition, Spectrochimica Acta Part B 65 (2010) 130-136, ELSEVIER, ISSN: 0584-8547, ISSN: 0584-8547, DOI:10.1016/j.sab.2009.12.005,
    5-Year Impact Factor (2012): 3.141;
    In Science Direct Top 25 Hottest Articles - Spectrochimica Acta Part B: Atomic Spectroscopy :
  • Certificate 4. January to March 2005: a No 21

    2012

  • 24. Velitchkova N., O. Veleva, S. Velichkov, P. Markov, N. Daskalova, Determination of As, Zn, Pt, B, Hg, Cd, Tl and U in environmental materials by high resolution radial viewing 40.68 MHz inductively coupled plasma optical emission spectrometry (ICP-OES), Bulgarian Chemical Communications, Volume 44, Number 2 (229 - 243) 2013, ISSN 0324-1130, ISSN: 08619808,
    Impact Factor (2012): 0.349;
  • 25. Atanassova I., N. Velichkova, M. Teoharov, Heavy metal mobility in soils under the application of sewage sludge, Bulgarian Journal of Agricultural Science Vol.18 No3 June 2012 p. 396-402, Agricultural Academy; ISSN 1310-0351;
    Impact Factor (2012) = 0.189

    2013

  • 26. Velitchkova N., O. Veleva, S. Velichkov, N. Daskalova, Possibilities of High Resolution Inductively Coupled Plasma Optical Emission Spectrometry in the Determination of Trace Elements in Environmental Materials, Journal of Spectroscopy Volume 2013, Article ID 505871, 12 pages, Hindawi Publishing Corporation, ISSN: 2314-4920 (Print), ISSN: 2314-4939 (Online),
    Impact Factor (2012): 0.530

    2014

  • 27. 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", " : , ", - , , Proceedings of scientific meeting " Rare and Trace elements in: geological, technological end environmental aspects, pp. 148-156, 27.11.2014, Sofia, Bulgaria. ISBN 978-954-92738-7-8, in Bulgarian, abstract in English. 2015
  • 28. 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" Proceedings of International conference "Soil and Agrotechnology in a Changing World" 11-15.05.2015, pp. 525-531, Edited by Assoc. Prof. L. Mischeva, in Bulgarian, abstract in English, , , ISBN: 978-619-90560-0-4
  • 29. N. Velitchkova, P. Petrova, S. Velichkov, N. Daskalova, Inductively coupled plasma optical emission spectrometry - determination of rare earth and platinum group of elements, Chemistry: Bulgarian Journal of Science Education, Volume 24, Number 3, 2015, 449-465, ISSN 0861-9255, http://khimiya.org/pdfs/CHEMISTRY_24_3_VELITCHKOVA.pdf,
    SJR (2015) = 0.190, h (2015) = 8

    2016

  • 30. Karadjov M., N. Velitchkova, O. Veleva, S. Velichkov, P.Markov, N. Daskalova, Spectral interferences in the determination of rhenium in molybdenum and copper concentrates by inductively coupled plasma optical emission spectrometry (ICP-OES), Spectrochimica Acta Part B 119 (2016) 76-82, ,
    Impact Factor (2014): 3.176

    Last update: 14.12.2016


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