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Reduction in welding fume and metal exposure of stainless steel welders: an example from the WELDOX study

  • Martin Lehnert
  • Tobias WeissEmail author
  • Beate Pesch
  • Anne Lotz
  • Sandra Zilch-Schöneweis
  • Evelyn Heinze
  • Rainer Van Gelder
  • Jens-Uwe Hahn
  • Thomas Brüning
  • The WELDOX Study Group
Original Article

Abstract

Purpose

In a plant where flux-cored arc welding was applied to stainless steel, we investigated changes in airborne and internal metal exposure following improvements of exhaust ventilation and respiratory protection.

Methods

Twelve welders were examined at a time in 2008 and in 2011 after improving health protection. Seven welders were enrolled in both surveys. Exposure measurement was performed by personal sampling of respirable welding fume inside the welding helmets during one work shift. Urine and blood samples were taken after the shift. Chromium (Cr), nickel (Ni), and manganese (Mn) were determined in air and biological samples.

Results

The geometric mean of respirable particles could be reduced from 4.1 mg/m3 in 2008–0.5 mg/m3 in 2011. Exposure to airborne metal compounds was also strongly reduced (Mn: 399 vs. 6.8 μg/m3; Cr: 187 vs. 6.3 μg/m3; Ni: 76 vs. 2.8 μg/m3), with the most striking reduction inside helmets with purified air supply. Area sampling revealed several concentrations above established or proposed exposure limits. Urinary metal concentrations were also reduced, but to a lesser extent (Cr: 14.8 vs. 4.5 μg/L; Ni: 7.9 vs. 3.1 μg/L). Although biologically regulated, the mean Mn concentration in blood declined from 12.8 to 8.9 μg/L.

Conclusion

This intervention study demonstrated a distinct reduction in the exposure of welders using improved exhaust ventilation and welding helmets with purified air supply in the daily routine. Data from area sampling and biomonitoring indicated that the area background level may add considerably to the internal exposure.

Keywords

Exposure reduction Welding fume Biological monitoring 

Notes

Acknowledgments

The WELDOX study and this intervention study were financially supported by the German Social Accident Insurance (DGUV). We thank the staff working for the MGU measurement system, especially Rolf Reichel and Frank Fiegehenn, and all welders for having participated. We gratefully acknowledge the field team, especially Hans Gese, Hans Berresheim and Eleonora Gutwinski.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Martin Lehnert
    • 1
  • Tobias Weiss
    • 1
    Email author
  • Beate Pesch
    • 1
  • Anne Lotz
    • 1
  • Sandra Zilch-Schöneweis
    • 1
  • Evelyn Heinze
    • 1
  • Rainer Van Gelder
    • 2
  • Jens-Uwe Hahn
    • 2
  • Thomas Brüning
    • 1
  • The WELDOX Study Group
  1. 1.Institute for Prevention and Occupational Medicine of the German Social Accident InsuranceInstitute of the Ruhr-Universität Bochum (IPA)BochumGermany
  2. 2.Institute for Occupational Safety and Health of the German Social Accident Insurance (IFA)Sankt AugustinGermany

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