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Jakob Löndahl

Jakob Löndahl

Associate Professor / Senior Lecturer

Jakob Löndahl

Exploring a new method for the assessment of metal exposure by analysis of exhaled breath of welders


  • Göran Ljungkvist
  • Håkan Tinnerberg
  • Jakob Löndahl
  • Therese Klang
  • Emilia Viklund
  • Jeong Lim Kim
  • Linus Schiöler
  • Niklas Forsgard
  • Anna Carin Olin

Summary, in English

Purpose: Air monitoring has been the accepted exposure assessment of toxic metals from, e.g., welding, but a method characterizing the actual dose delivered to the lungs would be preferable. Sampling of particles in exhaled breath can be used for the biomonitoring of both endogenous biomarkers and markers of exposure. We have explored a new method for the sampling of metals in exhaled breath from the small airways in a study on welders. Methods: Our method for particle sampling, Particles in Exhaled Air (PExA®), is based on particle counting and inertial impaction. We applied it on 19 stainless steel welders before and after a workday. In parallel, air monitoring of chromium, manganese and nickel was performed as well as blood sampling after work. Results: Despite substantial exposure to welding fumes, we were unable to show any significant change in the metal content of exhaled particles after, compared with before, exposure. However, the significance might be obscured by a substantial analytical background noise, due to metal background in the sampling media and possible contamination during sampling, as an increase in the median metal contents were indicated. Conclusions: If efforts to reduce background and contamination are successful, the PExA® method could be an important tool in the investigations of metals in exhaled breath, as the method collects particles from the small airways in contrast to other methods. In this paper, we discuss the discrepancy between our findings and results from studies, using the exhaled breath condensate (EBC) methodology.


  • Ergonomics and Aerosol Technology
  • NanoLund: Center for Nanoscience
  • Metalund

Publishing year







International Archives of Occupational and Environmental Health





Document type

Journal article




  • Environmental Health and Occupational Health
  • Respiratory Medicine and Allergy


  • Biomarkers
  • Exhaled breath
  • Exposure
  • Metals
  • Small airways
  • Welding




  • ISSN: 0340-0131