Concordia University



Dr. Gregor Kos

Lecturer, Chemistry and Biochemistry

Current office: SP 265.20

Office: L-SP 265-20 
Richard J. Renaud Science Complex,
7141 Sherbrooke W.
Phone: (514) 848-2424 ext. 3374


Postdoctoral studies (2003-2007), McGill University, Montreal, QC (Prof. Parisa Ariya)

PhD (2003), Vienna University of Technology, Vienna, Austria (Prof. Rudolf Krska)

Visiting scientist (2001), University of Idaho, Moscow, ID (Prof. Peter Griffiths)

MSc (2000), Vienna University of Technology, Vienna, Austria

MSc research (1999-2000), University of Plymouth, Plymouth, UK (Prof. Paul Worsfold)

Research activities

Research Interests

I am an environmental analytical scientist with a strong background in statistical analysis of observational data. I also employ modelling to understand tropospheric photochemical reactions, especially in an urban air quality context. I have significant field experience in developing and deploying analytical instrumentation in the High Arctic.

I am interested in statistical analysis of medium sized data sets (up to 500,000 observations), including multivariate data analysis of partially dichotomous data. I am very much interested interpreting measurement data for the application and validation of atmospheric chemistry models. My main statistical tools for data analysis are Matlab and R.

My current research focuses on (long-term) observations of urban pollutants in major Canadian cities on a local (i.e., street-level) scale in the direct vicinity of the pollutant sources and the general population

I also perform multivariate modelling of mid-infrared data for classification of contaminated agricultural commodities. In collaboration with Université Laval I also work on Risk Assessment Modeling for food allergens such as milk protein using Monte-Carlo simulations.

Previously, I was a lead author and chapter coordinator for the Canadian Mercury Science Assessment for the "Emissions" Chapter. I have also conducted a statistical evaluation of gaseous and reactive mercury species data from observations and model results. All mercury work was done in collaboration with Environment Canada.

During field studies in the High Arctic (in Alert, NU and Barrow, AK), I investigated the exchange of volatile organic compounds between snow and air using GC-FID and GC-MS.


Peer reviewed publications

  1. M. Eskola, G. Kos, C. T. Elliott, J. Hajslova, S. Mayar, R. Krska, Worldwide contamination of food-crops with mycotoxins: validity of the decades old FAO estimate of 25% today, Annual Review of Food Science and Technology, (2019), doi: 10.1080/10408398.2019.1658570

  2. T. Öner, P. Thiam, G. Kos, R. Krska, F. Schwenker, B. Mizaikoff, Machine learning algorithms for the automated classification of contaminated maize at regulatory limits via infrared attenuated total reflection spectroscopy, World Mycotoxin Journal, 12 (2019), 113-122, doi: 10.3920/WMJ2018.2333

  3. M. Sieger, G. Kos, M. Sulyok, M. Godejohann, R. Krska, B. Mizaikoff, MYCOSPEC: Harnessing Infrared Laser Spectroscopy for On-site Mycotoxin Analysis, Scientific Reports, 7 (2017), 44028, doi: 10.1038/srep44028

  4. P. Kovalsky, G. Kos, K. Nährer, C. Schwab, T. Jenkins, G. Schatzmayr, M. Sulyok, R. Krska, Co-occurrence of Regulated, Masked and Emerging Mycotoxins and Secondary Metabolites in Finished Feed and Maize – an Extensive Survey, Toxins (2016), 363, doi: 10.3390/toxins8120363

  5. G. Kos, M. Sieger, D. McMullin, C. Zahradnik, T. Öner, B. Mizaikoff, R. Krska, A Novel Chemometric Classification for FTIR Spectra of Mycotoxin-contaminated Maize and Peanuts at Regulatory Limits, Food Additives and Contaminants, Part A 33 (2016), 1596-1607, doi: 10.1080/19440049.2016.1217567

  6. Y. Nazarenko, R.B. Rangel-Alvarado, G. Kos, U. Kurien, P.A. Ariya, Novel Aerosol Analysis Approach for Characterization of Nanoparticulate Matter in Snow, Environmental Science and Pollution Research (2016), in press

  7. G. Kos, Y.-F. Li, D. Niemi, M. King, S.A. Smyth, C. Zdanowicz, J. Zheng, Releases of Mercury into Air and Water from Anthropogenic Activities in North America, in A. Steffen (ed.), Canadian Mercury Science Assessment (2016), isbn: 978-0-660-03315-0

  8. P.A. Ariya, M. Amyot, A. Dastoor, D.A. Deeds, M. Subir, A. Feinberg, G. Kos, A. Poulain, A. Ryjkov, K. Semeniuk, K. Toyota, Mercury Physicochemical and Biogeochemical Transformation in the Atmosphere and at Atmospheric Interfaces: A Review, Chemical Reviews 115 (2015) 3760-3802, doi: 10.1021/cr500667e

  9. G. Kos, V. Kanthasamy, N. Adechina, P.A. Ariya, Volatile organic compounds in Arctic snow: Concentrations and implications for atmospheric processes, Environmental Science: Processes & Impacts 16 (2014) 2592-2603, doi: 10.1039/C4EM00410H

  10. P.A. Ariya, G. Kos, R. Mortazavi, E.D. Hudson, V. Kanthasamy, N. Eltouny, J. Sun and C. Wilde, Bio-Organic Materials in the Atmosphere and Snow: Measurement and Characterization, in V.F. McNeill, P.A. Ariya (eds.), Atmospheric and Aerosol Chemistry, ISBN 978-3-642-41214-1, Springer, NY (2013). doi:10.1007/128_2013_461

  11. G. Kos, A. Ryzhkov, A. Dastoor, J. Narayan, A. Steffen, P. A. Ariya, L. Zhang,Evaluation of Discrepancy between Measured and Modeled Oxidized Mercury Species,Atmospheric Chemistry & Physics 13 (2013) 4839-4863, doi:10.5194/acp-13-4839-2013.

  12. D. Voisin, J.-L. Jaffrezo, S. Houdier, M. Barret, J. Cozic, M. King, J. France, H. Reay, A. Grannas , G. Kos , P. A. Ariya , H. Beine , F. Domine, Carbonaceous Species and HUmic LIke Substances (HULIS) in Arctic Snowpack During OASIS Field Campaign in Barrow, Journal of Geophysical Research-Atmospheres 117 (2012) D00R19, doi:10.1029/2011JD016612.

  13. P. A. Ariya, F. Domine, G. Kos, M. Amyot, V. Cote, H. Vali, T. Lauzier, L. Legagneux, W. F. Kuhs, K. Techmer, T. Heinrichs, R. Mortazavi, J. Bottenheim, Snow: A Photo-Bio-Chemical Exchange Platform with the Atmosphere, Environmental Chemistry8 (2011) 62-73,  doi:10.1071/EN10056.

  14. G. Kos, P. A. Ariya, Volatile Organic Compounds in Snow from Mont Saint Hilaire and the Tremblant Areas in South-Western Quebec, Journal of Geophysical Research – Atmospheres 115 (2010) D01302,  doi:10.1029/2009JD012391.

  15. P. A. Ariya, J. Sun, N. A. Eltouny, E. D. Hudson, C. T. Hayes and G. Kos, Physical and Chemical Characterization of Bioaerosols – Implications for Nucleation processes,International Reviews in Physical Chemistry 28 (2009) 1-32, doi:10.1080/01442350802597438.

  16. V. Cote, G. Kos, R. Mortazavi, P. A. Ariya, Microbial and “de novo” Transformation of Dicarboxylic Acids by Three Airborne Fungi, Science of the Total Environment340 (2008) 530-537, doi:10.1016/j.scitotenv.2007.10.035.

  17. G. Kos, H. Lohninger, R. Krska, Optimisation of the Sample Preparation Procedure for the Rapid Screening of Fungal Infection on Corn Using Mid-infrared Attenuated Total Reflection Spectroscopy (ATR), Food Additives and Contaminants, 24 (2006) 721-729, doi:10.1080/02652030601186111.

  18. G.Kos, P. A. Ariya, Determination of Wide Range Volatile Organic Compounds in Snow Using Solid Phase Micro-Extraction (SPME), Analytical and Bioanalytical Chemistry, 385 (2006) 57-66, doi:10.1007/s00216-006-0333-5.

  19. J. Stroka, M. Spanjer, S. Buechler, S. Barel, G.Kos, E. Anklam, Novel Sampling Methods for the Analysis of Mycotoxins and the Combination with Spectroscopic Methods for the Rapid Evaluation of Deoxynivalenol Contamination, Toxicology Letters 153, 1 (2004) 99-107, doi:10.1016/j.toxlet.2004.04.039.

  20. G. Kos, H. Lohninger, R. Krska, P. Griffiths, Rapid Screening of Fungal Infection on Corn using Mid-infrared Diffuse Reflection Spectroscopy (DRS) and Attenuated Total Reflection Spectroscopy (ATR): A Comparison Study, Analytical and Bioanalytical Chemistry 378 (2004) 159-166, doi:10.1007/s00216-003-2245-y.

  21. G. Kos, H. Lohninger, R. Krska, Validation of Chemometric Models for the Determination of Deoxynivalenol on Maize by Mid-Infrared Spectroscopy, Mycotoxin Research 19, 2 (2004) 149-153, doi:10.1007/BF02942955.

  22. G. Kos, H. Lohninger, R. Krska, Development of a Novel Rapid Method for the Determination of Fusarium Fungi on Corn using Mid-infrared Spectroscopy with Attenuated Total Reflection (FTIR-ATR) and Chemometrics, Analytical Chemistry75 (2003) 1211-1217, doi:10.1021/ac0260903.

  23. G. Kos, H. Lohninger, R. Krska, Fourier Transform Mid-infrared Spectroscopy with Attenuated Total Reflection (FT-IR/ATR) as a Tool for the Detection of Fusarium Fungi on Maize, Vibrational Spectroscopy 29 (2002) 115-119, doi:10.1016/S0924-2031(01)00196-5.

  24. G. Kos, H. Lohninger, R. Krska, Classification of Maize Contaminated with Fusarium Graminearum Using Mid-infrared Spectroscopy and Chemometrics, Mycotoxin Research, 18, S1 (2002) 104-108, doi:10.1007/BF02946074.

  25. G. Kos, H. Lohninger, R. Krska, Using Mid-Infrared Fourier-Transform-Spectroscopy with Attenuated Total Reflection (FT-IR/ATR) as a tool for the determination of Fusarium Graminearum on Maize, Mycotoxin Research, 17A, 1 (2001) 102-106, doi:10.1007/BF03036722.

Teaching activities

CHEM 217 Introductory Analytical Chemistry I (3 credits)

Prerequisites: CHEM 205, 206; PHYS 204, 206, 224, 226; MATH 203, 205; or equivalents for all prerequisite courses. 

Precipitation methods and solubility products; activity, chemical equilibria and titration curves of neutralization and complexation systems; treatment of analytical data. 

Lectures and laboratory.

CHEM 218 Introductory Analytical Chemistry II (3 credits)

Prerequisite: CHEM 217. 

Chemical equilibria and titration curves of oxidation-reduction, precipitation, and non-aqueous systems; potentiometry and potentiometric titrations; introduction to spectroscopy with emphasis on molecular and atomic absorption spectroscopy,  fluorescence spectroscopy. 

Lectures and laboratory.

CHEM 234 Physical Chemistry I: Thermodynamics (3 credits)

Prerequisites: CHEM 205, 206; PHYS 204, 206, 224, 226; MATH 203, 205; or equivalents for all prerequisite courses. 

The properties of real gases; fugacities; first, second and third laws of thermodynamics; the Phase Rule; one‐ and two‐component systems; real solutions, and partial molal properties. 

Lectures and tutorials.

INTE 298/SFYX 201 Integrated Science Module

Prerequisites: None

This courses is an integrative view of what is covered in the BIOL, CHEM, MATH and PHYS courses and disciplines. An inquiry project-based approach is  at the centre of this course and includes aspects of all of the discipline-specific courses in order to foster an interdisciplinary perspective. A focus will be on the development of academic (e.g., writing/research) and personal (e.g., collaborative/communication) skills relevant to scientific disciplines.

Projects, presentations and guest lectures

CHEM 298 Air, Water and Soil Processes (Selected Topics in Chemistry)

Prerequisites: CHEM212 or CHEM217

Introductory Environmental Chemistry with focus on atmospheric chemistry (air quality), water and soil chemistry. Includes a visit to a Montreal pollution monitoring station.


CHEM 498/610 Advanced Data Analysis

Prerequisites: CHEM312

An introduction to R and application to chemical data sets. Exploratory data analysis and plotting. Statistical methods discussed include linear regression, ANOVA, multivariate data analysis methods (e.g., PCA, PCR, PLS, decision trees, ANN). Introduction to Experimental Design.

In collaboration with Dr. D. Vuckovic and Dr. C. Skinner.


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