Proficiency testing for inorganic acids

(HCl, HNO3)

Test gas stream

Zoom Image

IFA's test gas stream
Source: IFA

The proficiency testing (PT) is offered alternatively with and without own sampling. Participants may choose whether they wish to perform sampling for inorganic acids themselves, or to have the sample carriers supplied to them [1].

The concentrations to be measured will lie within the range between 1/10 and two times the AGW [2] value.

Since there is only a short-time limit value for nitric acid, the concentration of one test gas is in accordance with this limit value. The concentrations of the other two test gases are in accordance with the limit value of hydrochloric acid.

For HCl and HNO3, the IFA recommends the analysis method for hazardous substances described in IFA Folder No. 6172 [3], DFG [4] or NIOSH [5].

Ion chromatography should be employed for analysis.

Proficiency testing scheme with own sampling

At the dynamic test gas stream at the IFA up to 25 participants can carry out parallel sampling.

  • When: 22/23th March 2022 (minimum number of participants is 8)
  • Where:
    Institut für Arbeitsschutz der Deutschen Gesetzlichen Unfallversicherung (IFA)
    Alte Heerstr. 111
    53757 Sankt Augustin
  • Concentration range: between 1/10 and two times the AGW value [2]
  • Number of test series: 3
  • Duration per test series: 2 hours plus preparation time and run-in period (round three will be a short time measurement) (15 min).
  • Accomodations: Hotels in Sankt Augustin

Participants will receive detailed information on the PT scheme, a description of the apparatus, and the connections for the sampling devices in particular, in good time.

Proficiency testing without own sampling

Volatile inorganic acids: HCI, HNO3

Loading of the sample carriers for volatile inorganic acids is performed at the dynamic test gas stream of the IFA. Alkaline impregnated quartz fibre filters are employed as sample carriers.

Each participant receives one sampling kits comprising of:

One sampling kit for HCI and HNO3 comprising of

  • Three loaded sample carriers (quartz fibre filters), and
  • Two unloaded sample carriers for blank value adjustment.

Covid-19 regulations:

Only one person per participating company is allowed to attend; this person must be able to prove that he/she has been fully vaccinated or that he/she has recovered from an infection (not more than ½ year ago).

Please also inform yourself again before your visit about the visit regulations of the DGUV that will then apply.



[1] Ringversuch Anorganische Säuren (Kennzahl 1630-2) In: IFA-Arbeitsmappe Messung von Gefahrstoffen. Lieferung: 02/2017

[2] GESTIS – Internationale Grenzwerte für chemische Substanzen

[3] Anorganische Säuren, flüchtig: Bromwasserstoff, Chlorwasserstoff, Salpetersäure (Kennzahl 6172). In: IFA-Arbeitsmappe Messung von Gefahrstoffen. 38. Lfg. IV/2007. Hrsg.: Institut für Arbeitsschutz der DGUV (IFA), Sankt Augustin. Erich Schmidt, Berlin 2011 - Losebl.-Ausg.

[4] Deutsche Forschungsgemeinschaft (DFG). Volatile inorganic acids (HCl, HBr, HNO3). In: Analyses of hazardous substances in air. Volume 6. Hrsg.: Kettrup, A. Wiley-VCH, Weinheim 2002

[5] Volatile Acids by Ion Chromatography (HCl, HBr, HNO3). Method 7907. In: NIOSH, Manual of Analytical Methods, Fifth Edition, Issue 1, 20 May 2014


Division 2: Chemical and biological hazards

Brigitte Maybaum
Krista Gusbeth
Franziska Nürnberger