Chemosorption sampling and analysis of formaldehyde in air. Influence on recovery during the simultaneous sampling of formaldehyde, phenol, furfural and furfuryl alcohol.

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Abstract
A method based on trapping formaldehyde on a 2,4-dinitrodinitrophenylhydrazine-coated porous polymer (Amberlite XAD-2) was evaluated for air sampling in occupational environments. The aldehyde was converted to its 2,4-dinitrophenylhydrazone on the adsorbent. The influence of some organic compounds which often occur together with formaldehyde, furfural, phenol and furfuryl alcohol was studied. The method allowed the sampling of formaldehyde in the range 0.1-10 mg/m3 of air, based on a 3-l (15 min) sample and a coating of 1%. Furfural, phenol and furfuryl alcohol did not interfere and may be conveniently sampled at the same time. Formaldehyde and furfural hydrazones were analyzed by high-performance liquid chromatography and phenol and furfuryl alcohol by gas chromatography.