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Method for determining airborne diisocyanates

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Abstract

A method has been developed for quantitatively determining 3 typical diisocyanates, viz. 2,4-toluylene diisocyanate (2,4-TDI), hexamethylene diisocyanate (HDI) and 4,4′-diphenyl-methane diisocyanate (MDI). The technique relies on chemisorption onto a suitable carrier material contained in an absorption tube coated with 1-(2-pyridyl)piperazine (2-PP). Stable urea derivatives with high molar absorptivity are formed, desorbed from the carrier material, separated by means of highpressure liquid chromatography and identified. The limits of detection for a sample volume of 20 1 of air are 0.9μg m−3 for 2,4-TDI and HDI, and 0.6μg m−3 for MDI. The derivatives are stable at 4°C for longer than 30 days. The influence of atmospheric humidity and the interference of dibutylamine on the detection reaction were investigated for 2,4-TDI and HDI. The whole procedure is easy to perform, highly sensitive and very reproducible and is suitable for monitoring concentrations of 2,4-TDI, HDI and MDI.

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Authors and Affiliations

  1. Laboratory for Environmental Analysis, BASF Aktiengesellschaft, D-6700, Ludwigshafen, Federal Republic of Germany

    Frank Hanus, Wolfgang Merz, Jürgen Oldeweme & Christoph Randt

Authors
  1. Frank Hanus
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  2. Wolfgang Merz
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  3. Jürgen Oldeweme
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  4. Christoph Randt
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Dedicated to Prof. Dr. W. Fresenius on the occasion of his 75th birthday

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Hanus, F., Merz, W., Oldeweme, J. et al. Method for determining airborne diisocyanates. Mikrochim Acta 96, 197–206 (1988). https://doi.org/10.1007/BF01236104

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  • DOI: https://doi.org/10.1007/BF01236104

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