Round-robin tests for metals

Production of the sampling media

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Wind tunnel and measurement chamber at IGF

Filter samples bearing metal particles will be shipped. Sampling is performed by means of the total dust sampling system (GSP) on cellulose-nitrate filters (pore size: 8 µm; diameter: 37 mm).

These samples are produced at the Institut für Gefahrstoff-Forschung of the BG RCI (IGF) in Dortmund. Aqueous metal salt solutions are pyrolysed by means of a flame generator. The resulting metal oxide particles are passed at a defined air flow rate through a steel tube (wind tunnel) with a length of 20 m and a diameter of 0.5 m (Figure). This tube opens into a measurement chamber with a volume of approximately 20 m³ in which the sampling units are located. Homogeneous distribution of the particles is assured at all points within the measurement chamber [1].

The concentrations are to be within a range of 0.1 to 2 times the applicable limit values (Table). In consideration of the analytic performance of the analysis methods to be employed, deviating concentration ranges are expected to be selected for copper, cobalt and nickel. These will be made known in good time.

Each participant receives a sample kit comprising:

  • Three loaded sample carriers, and
  • Four unloaded sample carriers for blank value adjustment.

The analysis method (AAS methods, ICP) may be selected freely. The recommended digestion method is that published by the DFG (the German Research Foundation) [2] and the IFA [3] for the digestion of metal dusts.

Limit values for metals in Germany

Metal Limit value in mg/m3
Zn 0.1 [4]
Cu 0.01 [4]
Pb 0.1 [4]
Ni 0.006 [4]
Co 0.0005 [5]


[1] Monsé, C. et al.: Development and Evaluation of a Nanoparticle Generator for Human Inhalation Studies with Airborne Zinc Oxide. Aerosol Sci. Technol. 48 (2014) No. 4, pp. 418-426

[2] Aufarbeitungsverfahren für Stäube zur Bestimmung des "Gesamtmetallgehaltes". In: DFG, Analytische Methoden zur Prüfung gesundheitsschädlicher Arbeitsstoffe, Luftanalysen. Band 1: Spezielle Vorbemerkungen, Abschnitt 4 "Probenahme und Bestimmung von Aerosolen und deren Inhaltsstoffen". 14. Lfg. Verlag Chemie, Weinheim 2005, pp. 31-32

[3] Aufarbeitungsverfahren zur Analytik metallhaltiger Stäube; Methodik zur Bestimmung des "Gesamtmetallgehaltes" (Kennzahl 6015). In: IFA-Arbeitsmappe Messung von Gefahrstoffen. Vol. 34, IV/2005. Ed.: Institut für Arbeitsschutz der DGUV (IFA), Sankt Augustin. Erich Schmidt, Bielefeld 2011 - Loose-leaf edition

[4] GESTIS International Limit Values

[5] Wieske, M.: Auswirkungen des Risikokonzeptes auf die Betriebe und Umsetzung in die betriebliche Praxis