School of Life Sciences
and Facility Management

Environmental Analytics

«From structural elucidation to trace analysis, we characterize and quantify small molecules and elements in complex matrices.» 

Dr. Susanne Kern
Head Research Group Environmental Analytics

Detection of trace substances - We use analytical methods to track certain substances of interest - be it fragrances and flavorings in cosmetics and food, marker substances for certain materials such as tyre abrasion, or chemicals of concern for the environment. The identification and quantification of organic compounds and elements at trace levels in materials and environmental samples requires analytical knowledge, experience and state-of-the-art equipment, which we successfully utilise at the ZHAW.

Focus - Development, validation and application of analytical methods in the field of mass spectrometry, chromatography and elemental analysis.

Competencies & Research

Our areas of interest and expertise include the identification and quantification of organic compounds in complex matrices such as environmental samples. By means of complex sample preparation such as enrichment by solid phase extraction (SPE) or gas phase sampling (headspace solid phase micro extraction, SPME) and subsequent chromatography (gas chromatography, GC, or liquid chromatography, LC) coupled with mass spectrometry (high and low resolution), even the smallest traces can be detected.

Sample preparation

  • Sample preparation with solid phase extraction (SPE)
  • Different extraction methods:
    • Liquid liquid extraction, Soxhlet
    • Preparative liquid chromatography (PrepLC) 
    • Volatile organic compounds - Headspace, solid phase micro extraction (SPME), In-Tube Extraction (ITEX), Dynamic Headspace, Sorption on tube such as Tenax, Automated derivatisation (silylation of fatty acids)

Experience and broad application in the field of mass spectrometry

  • Liquid chromatography – Mass spectrometry (LC-MS systems) with additional detection systems (e.g. DAD Diode array detector, ELSD evaporative light scattering detector, FLD Fluorescence detector)
  • Gas chromatography – Mass spectrometry (GC-MS systems) with additional detection systems (e.g. FID Flame ionisation detector, FPD Flame photometric detector, TCD Thermal conductivity detector, “O” Olfactometry)

Structure elucidation and trace analysis in complex matrices:

  • Liquid chromatography - Quadrupole time-of-flight mass spectrometry (LC-QTOF)
  • Gas chromatography - Quadrupole time-of-flight mass spectrometry (GC-QTOF)

Sample introduction systems such as

  • SPME (Solidphase Micro Extraction)
  • ITEX (In Tube Extraction)
  • HS (Headspace)
  • SBSE-TD (Stir Bar Sorptive Extraction with Thermal Desorption)
  • TDU (thermal desorption unit)
  • TSP (Thermal Separation Probe)

 

Application knowledge in the field of element analysis

  • Digests for element analysis
  • Optical emission spectrometry with inductively coupled plasma (ICP-OES)
  • Mass spectrometry with inductively coupled plasma (ICP-MS)
  • Mobile X-ray fluorescence instrument (ED-XRF)
  • Combustion Ion Chromatography (CIC)

Cooperation & Projects

It is estimated that over 70,000 different chemicals are produced by the industry every year. This covers a wide range of purposes, from agrochemicals and petrochemicals, plastics and resins to so-called consumer products. For a large number of substances, there is no information on their existence, degradability and toxicity in the environment.

The research group Environmental Analytics detects such chemicals in various materials and environmental samples. The strong networking and co-operation of our specialist group with other institutes and specialist departments results in a strong and broad knowledge base. Various research projects as well as Bachelor's and Master's theses are examples of this:

  • Analysis of tire abrasion-related compounds in environmental samples and assessment of their environmental fate (in collaboration with IUNR)
  • Trace-level VOC emission analysis using sorbent tubes (in collaboration with an external partner)
  • Extractables and Leachables (E&L) studies in various polymeric materials, packaging systems, cosmetic products, and food-contact materials (in collaboration with an external company)
  • Identification of semiochemicals and odor-active compounds for pest management applications (in collaboration with IUNR)
  • Characterization of oligomers for the production of bio-based plastics (in collaboration with School of Engineering and an external company)
  • Wastewater analysis of volatile organic compounds (VOCs) using headspace gas chromatography (HS-GC) (in collaboration with the Industrial Chemistry research group and an external company)

Team

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