Proficiency testing for volatile organic compounds (VOC) with thermal desorption

Several participants at IFA's test gas stream

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Test gas stream at the IFA
Source: IFA

Proficiency testing (PT) is offered alternatively with and without own sampling. Participants may choose whether they wish to perform sampling for volatile organic compounds themselves, or to have the self-conditioned loaded sample carriers supplied to them.

The PT scheme consists of two runs with different concentrations of the same substances within the test gas. The test gas will contain up to ten different substances.

The concentrations to be measured will lie within the range between 10 to 200 µg/m³ for each substance. The concentration of benzene will lie close to the acceptance concentration of 0.2 mg/m³ (60 ppb) [1]. Analysis has to be conducted by gas chromatography by means of thermal desorption according to DIN EN ISO 16017-1 [2], DIN EN ISO 16000-6 [3] or IFA Folder No. 8936 [4].

For benzene you can use the method according to IFA-Folder No. 6265, measurement method No. 2 [5].


Selection of VOC

Substance group Substances
Alkanes n-decane, n-dodecane, n-heptane, n-hexadecane, n-hexane, n-nonane, n-octane, pentadecane, n-tetradecane, n-tridecane, n-undecane
Alcohols butan-1-ol, 2-ethyl-1-hexanol
Aromates benzene, 3-carene, cumene, ethylbenzene, limonene, α-pinene, toluene, 1,2,3-trimethylbenzene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, o-, m-, p-xylene
Esters and Ethers n-butyl acetate, 2-butoxyethyl acetate, 2-(2-butoxy ethoxy)-ethyl acetate, 2-ethoxy ethylacetate
Ketones and aldehydes butan-2-one, hexanal, acetophenone, 4-methyl-2-pentanone
Siloxanes hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane

1 Proficiency testing with sampling

A large-scale dynamic test gas stream can be found at the IFA. It is suitable for parallel sampling by up to 13 participants.

When:

  • 1st series of experiments: 08 May 2018*
    Number of test series:
    Sampling for adjustment of blank values at the beginning, followed by two test series.
  • 2nd series of experiments: 15/16 May 2018
    Number of test series:
    One test series for adjustment of blank values followed by one test series, on both days each.

    *On repeated request this series of experiments is performed on a single day.

Valid for both of the dates:

  • Where:
    Institut für Arbeitsschutz der Deutschen Gesetzlichen Unfallversicherung (IFA)
    Alte Heerstr. 111
    53757 Sankt Augustin
    Germany
  • Concentration range: 10 to 200 µg/m³ per substance
  • Duration: 1.5 hours plus preparation time and run-in period.
  • Accomodations: Hotels at Sankt Augustin

Participants will receive detailed information on the PT, a description of the apparatus and the connections for the sampling devices in particular, and a list of the substances to be analysed in good time.

2 Proficiency testing without sampling

The production of samples for volatile organic compounds is conducted at the dynamic test gas stream of the IFA. The particular feature of this PT scheme is that thermal desorption tubes are employed for loading which must be conditioned by the participants prior to the PT. Each participant (analysis laboratory) submits seven thermal desorption tubes to the IFA. The tubes and the blank value adjustments will be loaded with a sampling volume of 2 l. Only personal air samplers are used at the IFA. The sample carrier should not generate a back pressure exceeding 5.0 kPa under the specified conditions. Where internally fabricated sample carriers are used, please supply an adapter (GL14/GL25 threaded connection) for the test gas stream.

Each participant receives a sample kit comprising:

  • Four loaded thermal desorption tubes (two duplicate analyses)
  • two tubes for blank value adjustment, removed from the pure gas of the dynamic test stream, before loading the tubes
  • one unloaded tube.

Sources

[1] Technical Rule for Hazardous Substances 910: Risk-related concept of measures for activities involving carcinogenic hazardous substances (TRGS 910). Version: February 2014. GMBl. (2014) No. 12, p. 258-270, last amended GMBl. (2014) No. 64, p. 1313

[2] DIN EN ISO 16017-1: Indoor, ambiant and workplace air - Sampling and analysis of volatile organic compounds by sorbent tube/thermal desorption/capillary gas chromatography - Part 1: Pumped sampling (10.01). Beuth, Berlin 2001

[3] DIN ISO 16000-6: Indoor air - Part 6: Determination of volatile organic compounds in indoor and test chamber air by active sampling on Tenax TA® sorbent, thermal desorption and gas chromatography using MS or MS-FID (ISO 16000-6:2011). Beuth, Berlin 2012

[4] VOC (Volatile Organic Compounds, Flüchtige Organische Substanzen) (Kennzahl 8936). In: IFA-Arbeitsmappe Messung von Gefahrstoffen. 45 Lfg. – X/2010. Ed.: Deutsche Gesetzliche Unfallversicherung (DGUV), Berlin. Erich Schmidt, Berlin 2011 – Loose-leaf edition

[5] Benzol, Messverfahren Nr. 2 (Kennzahl 6265). In: IFA-Arbeitsmappe Messung von Gefahrstoffen. Lfg. 2 – X/2013.

Contact

Division 2: Chemical and biological hazards

Brigitte Maybaum
Krista Gusbeth
Franziska Nürnberger