• Nikolaos S. Thomaidis “Measurement uncertainty in qualitative and quantitative wide – scope screening with LC-HRMS”, EURACHEM Workshop in “Uncertainty in Qualitative and Quantitative Analysis”, 29-30 May 2017, Nicosia, Cyprus.
  • Nikolaos S. Thomaidis “Targeted, semi-targeted and non-targeted screening approaches for food analysis” Workshop on “Non-Target Screening embedded in (Open Access) Platforms and its role in various disciplines”, 2-4 November 2016, Munich.
  • Nikolaos S. Thomaidis “Target and non-target LC-HRMS strategies for the detection of emerging contaminants in the aquatic environment”, 10th Aegean Analytical Chemistry Days (AACD 2016), September 29-October 2, 2016, Çanakkale, Turkey.
  • Nikolaos S. Thomaidis «Integrated target and non-target LC-HRMS strategies to characterize polar contaminants in the aquatic environment» 12th workshop on LC-MS/MS for environmental analysis and food safety, Barcelona, 5-6 July 2016.
  • Nikolaos S. Thomaidis “Analytical strategies to explore the polar fraction of environmental samples by non-target LC-HRMS screening” NonTarget2016, 29 May-3 June, 2016, Ascona, Switzerland.
  • Thomaidis N.S., Bletsou A.A., Damalas D.E. “Pesticides, their metabolites and transformation products in urban wastewater: a change of perspective using extensive target and suspect LC-HRMS screening” 11th European Pesticide Residue Workshop, May 24-27, 2016, Limassol, Cyprus, PD 096 and Bruker Lunch Seminar, p. (# 65).
  • Νικόλαος Θωμαΐδης “ΒΕΛΤΙΣΤΟΠΟΙΗΣΗ ΚΑΙ ΕΠΙΚΥΡΩΣΗ ΜΕΘΟΔΟΥ ΓΙΑ ΤΟ ΠΡΟΣΔΙΟΡΙΣΜΟ 2327 ΑΝΑΔΥΟΜΕΝΩΝ ΡΥΠΩΝ ΜΕ ΣΤΟΧΕΥΜΕΝΗ ΣΑΡΩΣΗ ΜΕ UPLC-QTοF-HRMS/MS” 6ο Τακτικό Συνέδριο Μετρολογίας, Αθήνα, 13 – 14 Μαΐου 2016.
  • Νικόλαος Θωμαΐδης «Αξιολόγηση επικινδυνότητας χημικών κινδύνων και συνοπτική περιγραφή των μοντέλων που χρησιμοποιούνται σε ευρεία κλίμακα» Ημερίδα ΕΦΕΤ «Αξιολόγηση επικινδυνότητας χημικών παραγόντων», 15 Δεκεμβρίου 2015, Αθήνα.
  • Nikolaos Thomaidis “Targeted determination of new psychoactive substances, drugs of abuse, psychoactive pharmaceuticals and other biomarkers in wastewater by LC-Q-ToF- HRMS” Testing the Waters II, Ascona, Switzerland, 10-15 October 2015.
  • V. L. Borova, N. S. Thomaidis, C. Pistos “Simultaneous detection of new psychoactive substances (NPSs) in wastewater of Greece” EuCheMS, 5th European Chemistry Congress (ECC), European Association for Chemical and Molecular Sciences, 31 August – 4 September, 2014, Istanbul, Turkey, p. 240 (O-A1-04-05).
  • Nikolaos S. Thomaidis “Wide-scope mass spectrometric screening determination of emerging contaminants in wastewater samples” 10th Annual LC/MS/MS Workshop on Environmental Applications and Food Safety, 1-3 July, 2014, Barcelona, Spain.
  • N.C. Maragou, N.S. Thomaidis, M.A. Koupparis “Optimization and Comparison of ESI and APCI LC-MS/MS Methods” HELLENIC MASS SPECTROMETRY SOCIETY Workshop “RECENT ADVANCES OF MASS SPECTROMETRY IN FOOD ANALYSIS”, 3rd November 2011, Athens, Greece.
  • Ν.Θωμαϊδης «Αναδυόμενοι ρύποι: Προσδιορισμός και παρουσία στο υδατικό περιβάλλον» 11ο ΣΥΝΕΔΡΙΟ ΚΥΠΡΟΥ-ΕΛΛΑΔΑΣ «Η συνεισφορά της Χημείας στον ανθρώπινο πολιτισμό. Παρελθόν, παρόν και μέλλον», 26-30 Οκτωβρίου, 2011, Λεμεσός, Κύπρος.
  • Θωμαΐδης Νικόλαος, «Ποιότητα επεξεργασμένων Υγρών Αποβλήτων» Ημερίδα «Διαχείριση Υδατικών Πόρων σε επίπεδο δήμου, λεκάνης απορροής, περιφέρειας», στα πλαίσια του 12th International Conference on Environmental Science and Technology, September 8-10, 2011, Rhodes, Greece.
  • Thomaidis N.S., A. S. Stasinakis, D. Mamais, V.G. Samaras, E. Iatrou, A. Asimakopoulos, O.S. Arvaniti, A. Ajibola, E.I. Ventouri, T.D. Lekkas “Occurrence and fate of emerging contaminants in sewage treatment plant of Athens” 12th International Conference on Environmental Science and Technology, September 8-10, 2011, Rhodes, Greece, p.233 (A231).
  • Νικόλαος Θωμαϊδης «Αναδυόμενοι χημικοί κίνδυνοι στα τρόφιμα» Ημερίδα ΕΕΧ: «Νέες τάσεις στο χώρο των τροφίμων», στα πλαίσια της έκθεσης CHEM2010, 20 Μαρτίου 2010, Metropolitan EXPO.
  • Nikolaos S. Thomaidis “The use of risk assessment of contaminants for taking measures and identification of future concerns” EFSA – EFET Joint Conference, Food safety and nutrition: from science to policy, 26-27 November, 2009, Athens.
  • N.S. Thomaidis, N.C. Maragou, E. Rosenberg, M.A. Koupparis “Analytical methods based on mass spectrometry for the determination of Endocrine Disrupting Compounds” Proceedings of the 6th Aegean Analytical Chemistry Days, Denisli, Turkey, 9-12 October, 2008, p.18.
  • Stavroula Chandrinou, Nikolaos S. Thomaidis, Constantinos Pappas, Jan-Willem Wegener, Seafood consumption as a route of exposure to organotin compounds in Greece, Proceedings of the International Workshop “Foods to Dye for – Contaminants – sampling, analysis, legal limits” 6-7 November, 2006, Limassol, Cyprus, Abs. A/A 14.
  • Ν. Θωμαΐδης “Εκτίμηση Αβεβαιότητας στις Χημικές Μετρήσεις”, Πρακτικά Ημερίδας “ΑΠΟ ΤΟ ΕΝ 45001 ΣΤΟ ISO/IEC 17025”, ΓΧΚ, 2001.